Zanussi ZGF 7820 User manual

GAS HOB
ZGF 7820
INSTRUCTION BOOKLET
Please read this instruction booklet before using the appliance
GB

2
Important Safety Information
You MUST read these warnings carefully before installing or using the hob. If you need
assistance, contact our Customer Care Department on 08705 727727
Installation
zThis appliance must be installed and serviced by a
competent person as stated in the Gas Safety
(Installation and Use) Regulations Current Editions
and the IEE Wiring Regulations.
zFor appliances installed in the Republic of Ireland
please refer to NSAI-Domestic Gas Installations
I.S.813 Current Editions and the ETCI Rules for
Electrical Installations.
zRemove all packaging before using the hob.
zEnsure that the gas and electrical supply complies
with the type stated on the rating plate, located near
the gas supply pipe.
zDo not attempt to modify the hob in any way.
Child Safety
zThis hob is designed to be operated by adults. Do
not allow children to play near or with the hob.
zThe hob gets hot when it is in use.
zChildren should be kept away until it has cooled.
zChildren can also injure themselves by pulling pans
or pots off the hob.
zThis appliance is not intended for use by children or
other persons whose physical, sensory or mental
capabilities or lack of experience and knowledge
prevents them from using the appliance safely without
supervision or instruction by a responsible person to
ensure that they can use the appliance safely.
During Use
zThis hob is intended for domestic cooking only. It is
not designed for commercial or industrial purposes.
zWhen in use a gas cooking appliance will produce
heat and moisture in the room in which it has been
installed. Ensure there is a continuous air supply,
keeping air vents in good condition or installing a
cooker hood with a venting hose.
zWhen using the hob for a long period time, the
ventilation should be improved, by opening a window
or increasing the extractor speed.
zDo not use this hob if it is in contact with water.
Do not operate the hob with wet hands.
zEnsure the control knobs are in the ‘OFF’ position
when not in use.
zWhen using other electrical appliances, ensure the
cable does not come into contact with the hot surfaces
of the cooking appliance.
zUnstable or misshapen pans should not be used on
the hob as unstable pans can cause an accident by
tipping or spillage.
zNever leave the hob unattended when cooking with
oil and fats.
zNever use plastic or aluminium foil dishes on the hob.
zPerishable food, plastic items and areosols may be
affected by heat and should not be stored above or
below the hob unit.
Service
zThis hob should only be repaired or serviced by an
authorised Service Engineer and only genuine
approved spare parts should be used.

3
For the User
Contents
For the Installer
Important Safety Information 2
Description of the Hob 4
Operation 5
Maintenance and Cleaning 5
Something Not Working? 6
Guarantee/Customer Service 15
Instructions for the Installer 7
Important safety requirements 8
Installation 9
Building In 10
Electrical connections 11
Wiring Diagram 12
Fault Finding 12
Commissioning 14
Conversion from Natural Gas to LPG 14
Keep this instruction book for future reference
and ensure it is passed on to any new owner.
This appliance complies with the following
E.E.C.Directives:
* 73/23 - 90/683
(Low VoltageDirective);
* 93/68 (General Directives);
* 89/336 (Electromagnetical
Compatibility Directive);
* 90/396 (Gas Appliances),
and subsequent modifications
Guide to Use the instructions
The following symbols will be found in the text to guide
you throughout the Instructions:
Safety Instructions
Step by step instructions for an operation
Hints and Tips
Environmental Information
))
))
)
Environmental Information
zAfter installation, please dispose of the packaging
with due regard to safety and the environment.
zWhen disposing of an old appliance, make it unusable,
by cutting off the cable.
zThe symbol on the product or on its packaging
indicates that this product may not be treated as
household waste. Instead it shall be handed over to
the applicable collection point for the recycling of
electrical and electronic equipment. By ensuring this
product is disposed of correctly, you will help prevent
potential negative consequences for the environment
and human health, which could otherwise be caused
by inappropriate waste handling of this product. For
more detailed information about recycling of this
product, please contact your local city office, your
household waste disposal service or the shop where
you purchased the product.
European guarantee 16

4
1. Auxiliary Burner
2. Semi-rapid Burners
3. Ultra-rapid Triple-crown Burner
4. Rapid Burner
5. Control knobs
Description of the Hob
2
1
4
3
2
5

5
Maintenance and Cleaning
Operation
Hob burners
To light a burner:
zpush in the relevant control knob and turn it
anticlockwise to maximum position;
zthen adjust the flame as required.
If the burner does not ignite, turn the control knob to
zero, and try again.
To ensure maximum burner efficiency, you should only
use pots and pans with a flat bottom fitting the size of
the burner used (see table).
Burner minimum maximum
diameter diameter
Ultra-rapid
(triple-crown) 180 mm 260 mm
Large (rapid) 180 mm 260 mm
Medium (semi-rapid) 120 mm 220 mm
Small (auxiliary) 80 mm 160 mm
))
))
)
Before any maintenance or cleaning can be carried
out, you must DISCONNECT the hob from the
electricity supply.
The hob is best cleaned whilst it is still warm, as
spillage can be removed more easily than if it is
left to cool.
The Hob Top
Regularly wipe over the hob top using a soft cloth well
wrung out in warm water to which a little washing up liquid
has been added. Avoid the use of the following:
- household detergent and bleaches;
- impregnated pads unsuitable for non-stick saucepans;
- steel wool pads;
- bath/sink stain removers.
Should the hob top become heavily soiled, it is
recommended that a cleaning product such as Hob Brite
or Bar Keepers Friend is used.
If you use a saucepan which is smaller than
the recommended size, the flame will spread
beyond the bottom of the vessel, causing the
handle to overheat.
Take care when frying food in hot oil or fat,
astheoverheatedsplashescouldeasilyignite.
As soon as a liquid starts boiling, turn down the
flame so that it will barely keep the liquid
simmering.
If the control knobs become difficult to turn, please
contact your local Zanussi Service Force Centre.
The Burners
The burner caps and crowns can be removed for cleaning.
Wash the burner caps and crowns using hot soapy water,
and remove marks with a mild paste cleaner. A well
moistened soap impregnated steel wool pad can be used
with caution, if the marks are particularly difficult to
remove.
After cleaning, be sure to wipe dry with a soft cloth.
A- Burner cap
B - Burner crown
C- Ignition electrode
Fig. 1
inserire
termocoppie

6
Something Not Working?
If the hob is not working correctly, please carry out the following checks before contacting your local Zanussi Service
Force Centre.
SYMPTOM
There is no spark when lighting the gas
The gas ring burns unevenly
SOLUTION
Check that the unit is plugged in and the electrical
supply is switched on
Check that the RCCB has not tripped (if fitted)
Check the mains fuse has not blown
Check the burner cap and crown have been
replaced correctly, e.g. after cleaning.
Check the main jet is not blocked and the burner
crown is clear of food particles.
Check the burner cap and crown have been
replaced correctly, e.g. after cleaning.
If after all these checks, your hob still does not operate
correctly, contact your local Zanussi Service Force
Centre.
Please note that it will be necessary to provide proof of
purchase for any in-guarantee service calls.
In-guarantee customers should ensure that the
above checks have been made as the engineer will
make a charge if the fault is not a mechanical or
electrical breakdown.
Cast Iron Pan Supports
The hob has cast iron pan supports.
Take care when removing them. They are very heavy and
could damage the hob or your kitchen furniture if you let
them fall down.
To keep the pan supports in the correct position, they
are hooked into hinges at the back of the hob. When
removing the pan supports, lift them up as shown in the
diagram. Never turn the pan supports on the hinges, this
could damage them.
Wash the pan supports using hot soapy water. If
necessary, a paste cleaner or a soap impregnated steel
wool pad can be used with caution.
After cleaning, be sure to wipe dry with a soft cloth.
Ignition electrode
The electric ignition is obtained through a ceramic
"electrode" and a metal electrode (Fig. 1 - letter C). Keep
these components very clean, to avoid lighting difficulties,
and check that the burner crown holes are not
obstructed.
YES
NO

7
OVERALL DIMENSIONS
Width: 680 mm
Depth: 510 mm
CUT OUT DIMENSIONS
Width: 560 mm
Depth: 480 mm
SUPPLY CONNECTIONS
Gas:
R 1/2 inch (1/2 inch male) Rear right hand corner
Electric:
230-240 V 50 Hz supply, 3 core flexible cable with non
rewireable plug fitted with a 3 amp cartridge fuse.
Ignition HT Spark
Spark Generator Ispra Control's BF 50066
220- 240V 0.6 VA T 120
Spark Gap Fixed
Rear Left Burner (semi rapid)
Heat Input 2.0 kW (6824 BTU/HR)
Front Left Burner (auxiliary)
Heat Input 1.0 kW (3413 BTU/HR)
Rear Right Burner (semi rapid)
Heat Input 2.0 kW (6824 BTU/HR)
Front Right Burner (rapid)
Heat Input 3.0 kW (10236 BTU/HR)
Central Burner (Ultra-rapid Triple-crown)
Heat Input 4.0 kW (13652 BTU/HR)
Burner Dia.Tap By-pass
1/100 mm
Auxiliary 28
Semi-rapid 32
Rapid 40
Ultra-rapid 56
Aeration adjustment none
Instructions for the Installer
Engineers technical data
APPLIANCE CLASS : 3
APPLIANCECATEGORY: II2H3+
APPLIANCE GAS SUPPLY: Natural gas G20 / 20mbar
BURNER RAPID SEMI-RAPID AUXILIARY
(large) (medium) (small)
POSITION MAX MIN MAX MIN MAX MIN MAX MIN
NOMINAL THERMAL
POWER kW 3.0 0.65 2.0 0.45 1.0 0.33 4.0 1.2
NOMINAL FLOW
RATE m3/h 0.286 0.062 0.190 0.043 0.095 0.031 0.381 0.114
NOZZLE REFERENCE 119 Adjust. 96 Adjust. 70 Adjust. 146 Adjust.
NOMINAL THERMAL
POWER kW 2.8 0.65 2.0 0.45 1.0 0.33 4.0 1.2
NOMINAL FLOW
RATE g/h 202 47 144 32 72 24 288 86
NOZZLE REFERENCE 86 40 71 32 50 28 98 56
NATURAL GAS
20 mbar TYPEOF
GAS
CHARACTERISTICS
LPG GAS
28-30/37 mbar
1/100 mm
1/100 mm
VALUE = 49.92 MJ/Kg VALUE = 37.78 MJ/m3
Ws - 50.7 MJ/ m3
ULTRA-RAPID
(triple-crown)

8
FITTING THE GAS HOB
WITHOUT A COOKER HOOD ABOVE
FITTING THE GAS HOB
WITH A COOKER HOOD ABOVE
700 mm
400 mm
400 mm
100 mm
55 mm
50 mm 50 mm
600 mm
700 mm
400 mm
400 mm
100 mm
55 mm
600 mm
50 mm 50 mm
FO 2369*
FO 2231*
Important safety requirements
This hob must be installed in accordance with the Gas
Safety (Installation and Use) Regulations (Current Edition)
and the IEE Wiring Regulations (Current Edition).
For appliances installed in the Republic of Ireland please
refer to NSAI- Domestic Gas Installation I.S. 813 Current
Editions and the ETCI Rules for Electrical Installations.
Provision for ventilation
Detailed recommendations are contained in the following
British Standards Codes Of Practice: B.S. 6172/ B.S.
5440, Part 2 and B.S. 6891 Current Editions.
The hob should not be installed in a bed sitting room
with a volume of less than 20 m3. If it is installed in a
room of volume less than 5 m3an air vent of effective
area of 110 cm2is required. If it is installed in a room of
volume between 5 m3and 10 m3an air vent of effective
area of 50 cm2is required, while if the volume exceeds
11 m3no air vent is required. However, if the room has a
door which opens directly to the outside no air vent is
required even if the volume is between 5 m3 and 11 m3. If
there are other fuel burning appliances in the same room,
B.S. 5440 Part 2 Current Edition, should be consulted to
determine the requisite air vent requirements.
For appliances installed in the Republic of Ireland please
refer to the NSAI- Domestic Gas Installation I.S. 813
Current Editions Table Four.
Location
The hob may be located in a kitchen, a kitchen/diner or
bed sitting room, but not in a bathroom or shower room.
Before making the cut out in the worktop ensure that
the edges of the hob that are to be near either a side or
rear wall have a minimum distance of 55 mm. between
the edge of the hob and the wall.
The minimum distance combustible material can be fitted
above the hob is 400 mm. If it is fitted below 400 mm. a
space of 50 mm. must be allowed from the edges of the
hob. The minimum distance combustible material can
be fitted directly above the hob is 700 mm. A minimum
distance of 100 mm. must be left between the side edges
of the hob and any adjacent cabinets or walls.
For appliances installed in the Republic of Ireland please
refer to NSAI- Domestic Gas Installation I.S 813 Current
Edition Section 7- Permitted Locations of Appliance.

9
Installation
IMPORTANT: This hob must be installed by a
competent person to the relevant Gas Standards.
Any gas installation must be carried out by a
competent person.
The manufacturer will not accept liability, should
the above instructions or any of the other safety
instructions incorporated in this book be ignored.
WHEN THE HOB IS FIRST INSTALLED
Once the hob has been installed, it is important to
remove any protective materials, which were put
on in the factory.
On the end of the shaft, which includes the G 1/2"
threaded elbow, adjustment is fixed so that the washer
is fitted between the components as shown in the
diagram. Screw the parts together without using
excessive force.
Gas Connection
Connection to the gas supply should be with either rigid
or semi-rigid pipe, i.e. steel or copper.
The connection should be suitable for connecting to R
1/2" (1/2 BSP male thread).
When the final connection has been made, it is essential
that a thorough leak test is carried out on the hob and
installation. Ensure that the main connection pipe does
not exert any strain on the hob.
A) End of shaft with nut
B) Washer
C) Elbow
It is important to install the elbow correctly, with
the shoulder on the end of the thread, fitted to the
hob connecting pipe.
Failure to ensure the correct assembly will cause
leakage of gas.
FO 0814
FO 0264
Cut Out Size
The dimensions of the cut-out are given in the diagram.
Rectangular cut-out size for hob
FO 2038
Dimensions are given in mm.

10
FO
2564 FO 2044
3
Dimensions are given in mm.
Building In
Building over a cupboard or
drawer
If the hob is to be installed above a cupboard or drawer it
will be necessary to fit a heat resistant board below the
base of the hob on the underside of the work surface.
It is also recommended to carry out the electrical
connection to the hob as shown in diagrams 1 and 2.
Building over a kitchen unit with
door
Proper arrangements must be taken in designing the
furniture unit, in order to avoid any contact with the bottom
of the hob which can be heated when it is operated. The
recommended solution is shown in diagram 3.
The panel fitted under the hob ("a") should be easily
removable to allow easy access if technical assistance
is needed. The space behind the kitchen unit ("b") can
be used for connections.
1
FO 2563
2
)
Fitting the Hob into the worktop
Carry out the building in of the hob as follows:
• put the seals supplied with the hob, on the
edges of the cut out: place them at 8 mm
from the front and rear edges of the cut
out and at 50 mm from the side edges,
as shown in the diagram, taking care that
the seals meet without overlapping;
• place the hob in the cut out, taking care that it
is centred;
• fix the hob with the relevant fixing clamps and
screws, as shown in the diagram. When the
screws have been tightened, the excess seal
can be removed.
The edge of the hob forms a double seal which prevents
the ingress of liquids.

11
Electrical connections
Any electrical work required to install this hob
should be carried out by a qualified electrician or
competent person, in accordance with the current
regulations.
THISHOBMUSTBEEARTHED.
The manufacturer declines any liability should these
safety measures not be observed.
This hob is designed to be connected to a 230-240 V
50 Hz AC electrical supply.
Before switching on, make sure the electricity supply
voltage is the same as that indicated on the hob rating
plate. The rating plate is located on the bottom of the
hob. A copy is attached on the back cover of this book.
The hob is supplied with a 3 core flexible supply cable
incorporating a 3amp plug fitted. In the event of having to
change the fuse, a 3amp ASTA approved (BS 1362) fuse
must be used.
Should the plug need to be replaced for any reason, the
wires in the mains lead are coloured in accordance with
the following code:
Green and Yellow - Earth
Blue - Neutral
Brown - Live
— Connect the green and yellow (earth) wire to
the terminal in the plug which is marked with
the letter 'E' or the earth symbol or coloured
green and yellow.
— Connect the blue (neutral) wire to the terminal
in the plug which is marked with the letter 'N'
or coloured black.
— Connect the brown (live) wire to the terminal in
the plug which is marked with the letter 'L' or
coloured red.
Upon completion there must be no cut, or stray strands
of wire present and the cable clamp must be secure over
the outer sheath.
A cut off plug inserted into a 13 amp socket is
a serious safety (shock) hazard. Ensure that
the cut off plug is disposed of safely.
Permanent Connection
In the case of a permanent connection, it is necessary
that you install a double pole switch between the hob
and the electricity supply (mains), with a minimum gap
of 3 mm. between the switch contacts and of a type
suitable for the required load in compliance with the
current electric regulations.
The switch must not break the yellow and green earth
cable at any point.
Ensure that the hob supply cable does not
come into contact with surfaces with
temperatures higher than 50 deg. C.
)
FO 0199
a
Seal
FO 0390
Min. size Cable/flex Cable / flex type Fuse
0.75 mm2H05 V2V2-F (T90) 3 A
Supply cable replacement
The cable used to connect the hob to the electrical supply
must comply to the specifications given below.

12
Fault Finding
Preliminary Electrical Systems
Check
A.EARTH CONTINUITYCHECK- Appliance must
be electrically disconnected - meter set on Ω
(Ohms) x 1 scale and adjust zero if necessary.
a) Test leads from any appliance earth point to earth
pin on plug. Resistance should be less than
0.1 Ω (Ohm), check all earth wires for continuity
and all contacts are clean and tight.
B. INSULATION CHECK - Appliance electrically
disconnected, all switches ON.
a) meter set on Ω(Ohms) x 1 scale.
Test leads from L to N in appliance terminal
block. If meter reads «0» then there is a short
circuit.
b) meter set on Ω (Ohm) x 100 scale.
Repeat test with leads from L to E. If meter reads
less than ∞(infinity) there is a fault.
NOTE - Should it be found that the fuse has failed
but no fault is indicated - a detailed continuity check
(i.e. by disconnecting and checking each
component) is required to trace the faulty
component.
It is possible that a fault could occur as a result of
local burning/arcing but no fault could be found under
test. However a detailed visual inspection should
reveal evidence of burning around the fault.
START
Isolate appliance
and carry out:
A:Earth Continuity
check.
Has inlet fuse blown?
Carry out:
C: Polarity check.
Electricity supply
should now be
satisfactory.
Carry out:
D: Resistance to
Earth check.
Inlet wiring
faulty.
Rectify any
fault.
Isolate appliance and
carry out:
B: Insulation check.
Rectify any fault
including replacing
fuses as necessary.
SOCKET
(face view)
PLUG (with cover
removed)
Earth Wire
Green/Yellow
Neutral Wire
Blue
Brown Blue
Green
Yellow
Brown
Blue
( )
FUSE
( )
E
NL
NO YES
NO YES
A. IGNITOR SWITCH
B. IGNITOR UNIT
B
L
N
0
1
2
3
4
5
6
220/240
A
Wiring Diagram

13
Ignition System / Gas Ignition
YES
Check plug top fuse
and
replace if necessary
Check polarity and
earth continuity of
supply point
Check earth continuity
of appliance
Ignitor does not spark
Check fitting of burners
Check position of the
electrode
Check by pass simmer
adjusted
Light burner manually
Check gas supply at
burner
Check continuity from 'N' on the
mains connector block and "O" on
the ignitor unit
Check continuity from 'L' on the
mains connector block and the
taps ignition switches
Check continuity from ignition
switches connector to ignitor unit
Check continuity from the tip of
each electrode to the
terminals 1 to 4 on the ignitor
unit
Check for breaks in the
insulation
of the HT leads
Change the taps ignition
switches
NO
Change the ignitor unit

14
Commissioning
When the hob has been fully installed it will be necessary
to check the minimum flame setting. To do this, follow
the procedure below.
- Turn the gas tap to the MAX position and ignite.
- Set the gas tap to the MIN flame position then turn
the control knob from MIN to MAX several times. If
the flame is unstable or is extinguished follow the
procedure below.
Procedure:
Re-ignite the burner and set to MIN.
Remove the control knob.
To adjust, use a thin bladed screwdriver and
turn the adjustment screw (see diagram) until
the flame is steady and does not extinguish,
when the knob is turned from MIN to MAX.
Repeat this procedure for all burners.
Pressure Testing
Remove left hand pan support and front left
burner cap and crown.
Fit manometer tube over the injector.
Turn on the burner gas supply and ignite
another burner.
The pressure reading should be nominally
20mbar and must be between 17 mbar and
25mbar.
Turn off the burner supplies.
)
)Minimum adjustment screw
Conversion from Natural Gas to LPG
IMPORTANT
The replacement/conversion of the gas hob should only
be undertaken by a competent person.
It is important to note that this model is designed for use
with natural gas but can be converted for use with butane
or propane gas providing the correct injectors are fitted.
The gas rate is adjusted to suit.
Method
• Ensure that the gas taps are in the 'OFF' position
• Isolate the hob from the electrical supply
• Remove all pan supports, burner caps, rings, crowns
and control knobs.
• With the aid of a 7mm box spanner the burner injectors
can then be unscrewed and replaced by the
appropriate LPG injectors.
To adjust the gas rate
With the aid of a thin bladed screwdriver completely
tighten down the by pass adjustment screw. Upon
completion stick the replacement rating plate on the under
side of the hob.

15
Guarantee/CustomerService
Standard guarantee conditions
We, Zanussi-Electrolux, undertake that if within 12 months of the date of the purchase this Zanussi-Electrolux appliance
or any part thereof is proved to be defective by reason only of faulty workmanship or materials, we will, at our option
repair or replace the same FREE OF CHARGE for labour, materials or carriage on condition that:
· The appliance has been correctly installed and used only on the electricity supply stated on the rating plate.
· The appliance has been used for normal domestic purposes only, and in accordance with the manufacturer’s instruc-
tions.
· The appliance has not been serviced, maintained, repaired, taken apart or tampered with by any person not author-
ised by us.
· Electrolux Service Force Centre must undertake all service work under this guarantee.
· Any appliance or defective part replaced shall become the Company’s property.
· This guarantee is in addition to your statutory and other legal rights.
Exclusions
· Damage or calls resulting from transportation, improper use or neglect, the replacement of any light bulbs or remov-
able parts of glass or plastic.
· Costs incurred for calls to put right an appliance which is improperly installed or calls to appliances outside the
United Kingdom.
· Appliances found to be in use within a commercial environment, plus those which are subject to rental agreements.
· Products of Electrolux manufacturer that are not marketed by Electrolux.
Service and Spare Parts
In the event of your appliance requiring service, or if you wish to purchase spare parts, please contact your local
Service Force Centre by telephoning
0870 5 929 929
Your telephone call will be automatically routed to the Service Force Centre covering your postcode area.
For the address of your local Service Force Centre and further information about Service Force, please visit the
website at
www.serviceforce.co.uk
Before calling out an engineer, please ensure you have read the details under the heading “Something not working”
When you contact the Service Force Centre you will need to give the following details:
1.Your name, address and postcode.
2.Your telephone number.
3. Clear concise details of the fault.
4. The model and Serial number of the appliance (found on the rating plate).
5.The purchase date.
Please note a valid purchase receipt or guarantee documentation is required for in guarantee service calls.
Customer Care
For general enquiries concerning your Electrolux appliance, or for further information on Electrolux products please
contact our Customer Care Department by letter or telephone at the address below or visit our website at
www.electrolux.co.uk
Customer Care Department
Electrolux Major Appliances
Addington Way
Luton
Bedfordshire, LU4 9QQ
Tel: [phone] (*)
(*) Calls may be recorded for training purposes

16
This appliance is guaranteed by Electrolux in each of the countries listed at the back of this user manual, for the period
specified in the appliance guarantee or otherwise by law. If you move from one of these countries to another of the countries
listed below the appliance guarantee will move with you subject to the following qualifications:
• The appliance guarantee starts from the date you first purchased the appliance which will be evidenced by production of
a valid purchase document issued by the seller of the appliance.
• The appliance guarantee is for the same period and to the same extent for labour and parts as exists in your new country
of residence for this particular model or range of appliances.
• The appliance guarantee is personal to the original purchaser of the appliance and cannot be transferred to another user.
• The appliance is installed and used in accordance with instructions issued by Electrolux and is only used within the home,
i.e. is not used for commercial purposes.
• The appliance is installed in accordance with all relevant regulations in force within your new country of residence.
The provisions of this European Guarantee do not affect any of the rights granted to you by law.
European guarantee

17

18

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35687-8702 11/06
Grafiche MDM - Forlì
www.zanussi-electrolux.co.uk