– UPDATE – 

Slightly more comprehensive list here

A

Aberdeen
01224

Andover
01264

Ashford
01233

Aylesbury
01296

Ayr
01292

B

Banbury
01295

Bangor Co Down
02891

Barnsley
01226

Barnstaple
01271

Barrow-in-Furness
01229

Basildon
01268

Basingstoke
01256

Bath
01225

Bedford
01234

Belfast
028

Birchwood/Lincoln
01522

Birmingham
0121

Bishops Stortford
01279

Blackburn
01254

Blackpool
01253

Bolton
01204

Boston
01205

Bournemouth
01202

Bracknell
01344

Bradford
01274

Brentwood
01277

Bridgend
01656

Bristol
0117

Burnley
01282

Burton-on-Trent
01283

Bury St Edmunds
01284

C

Camberley
01276

Cambridge
01223

Canterbury
01227

Cardiff
029

Carlisle
01228

Carmarthen
01267

Chelmsford
01245

Cheltenham
01242

Chester
01244

Chesterfield
01246

Chichester
01243

Chippenham
01249

Clacton-on-Sea
01255

Colchester
01206

Coventry
024

Crawley
01293

Crewe
01270

D

Darlington
01325

Derby
01332

Doncaster
01302

Dorchester
01305

Dumfries
01387

Dundee
01382

Dunfermline
01383

Durham
01913

E

East Kilbride
01355

Eastbourne
01323

Edinburgh
0131

Evesham
01386

Exeter
01392

F

Falkirk
01324

Fareham
01329

Folkestone
01303

G

Glasgow
0141

Gloucester
01452

Grantham
01476

Gravesend
01474

Great Yarmouth
01493

Grimsbey
01472

Guildford
01483

H

Halifax
01422

Harrogate
01423

Hartlepool
01429

Haywards Heath
01444

Hemel Hempstead
01442

Hereford
01432

High Wycombe
01494

Hove / Brighton
01273

Huddersfield
01484

Hull (aka Kingston upon Hull)
01482

I

Inverness
01463

Ipswich
01473

K

Keighley
01535

Kendal
01539

Kidderminster
01562

Kings Lynn
01553

L

Leamington Spa
01926

Leeds
0113

Leicester
0116

Liverpool
0151

London (inner)
0207

London (outer)
0208

Londonderry
02871

LoughBorough
01509

Lowestoft
01502

Luton
01582

M

Macclesfield
01625

Maidenhead
01628

Maidstone
01622

Manchester
0161

Mansfield
01623

Merthyr Tydfil
01685

Middlesbrough
01642

Milton Keynes
01908

N

Newbury
01635

Newcastle
0191

Newport, Gwent
01633

Newry
02830

Newton Abbot
01626

Northampton
01604

Northwich
01606

Norwich
01603

Nottingham
0115

O

Orpington
01689

Oxford
01865

P

Penzance
01736

Perth
01738

Peterborough
01733

Plymouth
01752

Portsmouth
023

Preston
01772

R

Reading
0118

Redditch
01527

Redhill
01737

Rhyl
01745

Rochdale
01706

Romford
01708

Rotherham
01709

Rugby
01788

S

Salisbury
01722

Scarborough
01723

Scunthorpe
01724

Sheffield
0114

Shrewsbury
01743

Sittingbourne
01795

Slough
01753

Southampton
023

Southend
01702

Southport
01704

St Albans
01727

St Helens
01744

Stafford
01785

Staines
01784

Stamford
01780

Stevenage
01438

Stirling
01786

Stoke-on-Trent
01782

Stratford-upon-Avon
01789

Sunderland & Wearside
01915

Swansea
01792

Swindon
01793

T

Taunton
01823

Telford
01952

Torquay
01803

Truro
01872

Tunbridge Wells
01892

U

Uxbridge
01895

W

Wakefield
01924

Warrington
01925

Wellingborough
01933

Wem
01939

Wigan
01942

Winchester
01962

Wolverhampton
01902

Worcester
01905

Worksop
01909

Worthing
01903

Wrexham
01978

Y

Yeovil
01935

York
01904