SHOW MENUNational System Keyings – Shortcodes
| Keying | Date | Code | Other keying | Place(s) |
|---|---|---|---|---|
| ABsc | Original | 01/01 | ABEEN | Aberdeen, Aberdeenshire |
| ALsc | Original | 24/10 | STANS | St.Albans, Hertfordshire |
| BAsc | Original | 02/01 | BATTH | Bath, Somerset |
| BBsc | Original | 03/01 | BLARN | Blackburn, Lancashire |
| BDsc | Original | 07/01 | BRARD | Bradford, West Yorkshire |
| BHsc | Original | 19/64 | BOUTH | Bournemouth, Hampshire |
| BLsc | Original | 05/01 | BOLON | Bolton, Lancashire |
| BNsc | Original | 08/01 | Brighton, East Sussex | |
| BPsc | Original | 06/01 | Barnstaple, Devon | |
| BRsc | Original | 10/01 | BROEY | Bromley, Kent |
| BSsc | Original | 20/64 | BRIOL | Bristol |
| BTsc | Original | 14/64 | BELST | Belfast |
| Bsc | Original | 44/30 | BIRAM | Birmingham |
| CAsc | Original | 13/01 | CARLE | Carlisle, Cumbria |
| CBsc | Original | 11/01 | CAMGE | Cambridge, Cambridgeshire |
| CFsc | Original | 12/01 | CARFF | Cardiff |
| CHsc | Original | 14/01 | CHEER | Chester, Cheshire |
| CMsc | Original | 47/64 | CHERD | Chelmsford, Essex |
| Original | 61/01 | CHERD | Chelmsford, Essex | |
| COsc | Original | 40/01 | COLER | Colchester, Essex |
| CRsc | Original | 17/01 | CROON | Croydon, Surrey |
| CTsc | Original | 05/39 | CANRY | Canterbury, Kent |
| CVsc | Original | 15/01 | COVRY | Coventry, Warwickshire |
| CWsc | Original | 16/01 | CREWE | Crewe, Cheshire |
| DAsc | Original | 18/01 | DARRD | Dartford, Kent |
| DBsc | 1978 | 40/15 | DUBIN | Dublin |
| DDsc | Original | 20/01 | DUNEE | Dundee, Angus |
| DEsc | Original | 19/01 | DERBY | Derby, Derbyshire |
| DGsc | Original | 08/35 | DUMES | Dumfries, Dumfries-shire |
| DHsc | Original | 08/47 | DURAM | Durham, Co.Durham |
| DLsc | Original | 07/47 | DARON | Darlington, Co.Durham |
| DNsc | Original | 54/01 | DONER | Doncaster, South Yorkshire |
| DTsc | Original | 08/14 | DORER | Dorchester, Dorset |
| DYsc | Original | 08/29 | DUDEY | Dudley, West Midlands |
| ECsc | Original | 07/64 | London EC | |
| EHsc | Original | 13/64 | EDIGH | Edinburgh |
| ENsc | Original | 09/15 | ENFLD | Enfield, Middlesex |
| 1978 | 24/15 | Enfield, Middlesex | ||
| EXsc | Original | 21/01 | EXEER | Exeter, Devon |
| Esc | Original | 05/64 | London E | |
| FKsc | Original | 09/31 | FALRK | Falkirk, Stirlingshire |
| FYsc | Original | 59/01 | BLAOL | Blackpool, Lancashire |
| GLsc | Original | 21/64 | GLOER | Gloucester, Gloucestershire |
| GUsc | Original | 10/56 | GUIRD | Guildford, Surrey |
| Gsc | Original | 09/64 | GLAOW | Glasgow |
| HAsc | Original | 23/01 | Harrow, Middlesex | |
| HDsc | Original | 24/01 | HUDLD | Huddersfield, West Yorkshire |
| HGsc | Original | 22/01 | HARTE | Harrogate, North Yorkshire |
| HPsc | Original | 11/44 | HEMAD | Hemel Hempstead, Hertfordshire |
| HRsc | Original | 62/01 | Hereford, Herefordshire | |
| HUsc | Original | 25/01 | HULLL | Hull, North Humberside |
| HXsc | Original | 11/05 | HALAX | Halifax, West Yorkshire |
| IGsc | Original | 52/01 | ILFRD | Ilford, Essex |
| IMsc | 1993 | 40/28 | Isle of Man | |
| IPsc | Original | 26/01 | IPSCH | Ipswich, Suffolk |
| IVsc | Original | 12/41 | INVSS | Inverness, Inverness-shire |
| KAsc | Original | 13/16 | KILCK | Kilmarnock, Ayrshire |
| 197X | 24/18 | Kilmarnock, Ayrshire | ||
| KTsc | Original | 27/01 | KINES | Kingston upon Thames, Surrey |
| KWsc | Original | 28/58 | WICCK, KW1 | Wick, Caithness |
| KYsc | Original | 13/32 | KIRDY | Kirkcaldy, Fife |
| LAsc | Original | 13/51 | LANER | Lancaster, Lancashire |
| LDsc | Original | 24/64 | Llandrindod Wells, Powys | |
| LEsc | Original | 28/01 | LEIER | Leicester, Leicestershire |
| LLsc | Original | 14/50 | LLANO, LL30 | Llandudno, Gwynedd |
| LNsc | Original | 14/31 | LINLN | Lincoln, Lincolnshire |
| LSsc | Original | 12/64 | LEEDS | Leeds |
| LUsc | Original | 58/01 | Luton, Bedfordshire | |
| LXsc | Original | 22/50 | Liverpool | |
| Lsc | Original | 11/64 | LIVOL | Liverpool |
| MEsc | Original | 19/54 | ROCER | Rochester, Kent |
| MKsc | Original | 64/01 | MILES | Milton Keynes, Buckinghamshire |
| MLsc | Original | 16/61 | MOTLL | Motherwell, Lanarkshire |
| MXsc | Original | 23/15 | Manchester | |
| Msc | Original | 10/64 | MANER | Manchester |
| NEsc | Original | 16/64 | NEWNE | Newcastle-on-Tyne, Tyne and Wear |
| NGsc | Original | 17/64 | NOTAM | Nottingham, Nottinghamshire |
| NNsc | Original | 31/01 | Northampton, Northamptonshire | |
| NPsc | Original | 30/01 | Newport, Gwent | |
| NRsc | Original | 32/01 | Norwich, Norfolk | |
| NWsc | Original | 06/64 | London NW | |
| Nsc | Original | 03/64 | London N | |
| OLsc | Original | 17/59 | OLDAM | Oldham, Lancashire |
| OXsc | Original | 33/01 | OXFRD | Oxford, Oxfordshire |
| PAsc | Original | 18/17 | PAIEY | Paisley, Renfrewshire |
| PEsc | Original | 34/01 | PETGH | Peterborough, Cambridgeshire |
| PHsc | Original | 25/64 | Perth, Perthshire | |
| PLsc | Original | 35/01 | PLYTH | Plymouth, Devon |
| POsc | Original | 36/01 | Portsmouth, Hampshire | |
| PRsc | Original | 37/01 | PREON | Preston, Lancashire |
| RGsc | Original | 38/01 | REANG | Reading, Berkshire |
| RHsc | Original | 39/01 | REDLL | Redhill, Surrey |
| RMsc | Original | 22/64 | ROMRD | Romford, Essex |
| SAsc | Original | 43/01 | SWAEA | Swansea, West Glamorgan |
| SEsc | Original | 01/64 | London SE | |
| 1986 | 08/51 | London SE | ||
| SGsc | Original | 25/52 | STEGE | Stevenage, Hertfordshire |
| SKsc | Original | 18/64 | Stockport, Cheshire | |
| SLsc | Original | 55/01 | SLOGH | Slough, Berkshire |
| SMsc | Original | 46/01 | SUTON | Sutton (and Morden), Surrey |
| 197X | 24/40 | SUTON | Sutton, Surrey | |
| SNsc | Original | 26/31 | SWION | Swindon, Wiltshire |
| SOsc | Original | 42/01 | Southampton, Hampshire | |
| SPsc | Original | 24/29 | SALRY | Salisbury, Wiltshire |
| SRsc | Original | 53/01 | SUNND | Sunderland, Tyne and Wear |
| SSsc | Original | 47/01 | Southend on Sea, Essex | |
| STsc | Original | 45/01 | STONT | Stoke on Trent, Staffordshire |
| SWsc | Original | 04/64 | London SW | |
| SYsc | Original | 41/01 | SHRRY | Shrewsbury, Shropshire |
| Ssc | Original | 15/64 | SHELD | Sheffield |
| TAsc | Original | 26/43 | TAUON | Taunton, Somerset |
| TDsc | Original | 10/13 | GALLS | Galashiels, Selkirkshire |
| TFsc | Original | 44/01 | TELRD | Telford, Shropshire |
| TNsc | Original | 27/41 | TUNLS | Tunbridge Wells, Kent |
| TQsc | Original | 09/01 | TORAY | Torquay, Devon |
| TRsc | Original | 27/39 | TRURO | Truro, Cornwall |
| TSsc | Original | 29/01 | MIDGH | Middlesbrough, North Yorkshire |
| TWsc | Original | 27/43 | TWIAM | Twickenham, Middlesex |
| UBsc | Original | 26/64 | Southall, Middlesex | |
| WAsc | Original | 46/64 | WARON | Warrington, Lancashire |
| Original | 60/01 | WARON | Warrington, Lancashire | |
| WCsc | Original | 08/64 | London WC | |
| WDsc | Original | 48/01 | WATRD | Watford, Hertfordshire |
| 1978 | 26/05 | Watford, Hertfordshire | ||
| WFsc | Original | 28/06 | WAKLD | Wakefield, West Yorkshire |
| WNsc | Original | 28/61 | WIGAN | Wigan, Lancashire |
| WRsc | Original | 56/01 | WORER | Worcester, Worcestershire |
| WSsc | Original | 57/01 | WALLL | Walsall, West Midlands |
| 1976 | 06/01 | Walsall, West Midlands | ||
| 1996 (Apr) | 06/01 | WS1 | Walsall, West Midlands | |
| WVsc | Original | 50/01 | Wolverhampton, West Midlands | |
| 1973? | 29/27 | WOLON | Wolverhampton, West Midlands | |
| Wsc | Original | 02/64 | London W | |
| YOsc | Original | 49/01 | YORRK | York, North Yorkshire |
| ZEsc | Original | 14/19 | LERCK, ZE1 | Lerwick, Shetland |
