As discussed in the post on requesting UK city communities on Feddit.uk in some cases it may be better to start a wider regional community (county, city region, etc) and then spin off ones for cities and towns as it grows.

And, yes, there'll be some debate over names. Either debate it below (where you should also flag up ommisions) or get cracking and we can tidy up later.

Administrative divisions (countries, principalities and the like) of the United Kingdom

• England
• Scotland
• Wales
• Northern Ireland
• Channel Islands
• Isle of Man

Regions or sub-divisions (counties, both metropolitan and non-metropoiitan, often defaulting to the traditional counties for now):

England:

• Bedfordshire
• Berkshire
• Buckinghamshire
• Cambridgeshire
• Cheshire
• Cornwall
• Cumbria
• Derbyshire
• Devon
• Dorset
• County Durham
• Essex
• Gloucestershire
• Hampshire
• Herefordshire
• Hertfordshire
• Huntingdonshire?
• Isle of Wight
• Isles of Scilly
• Kent
• Lancashire
• Leicestershire
• Lincolnshire
• Liverpool - Liverpool City Region
• London - Greater London
• Manchester - Greater Manchester
• Middlesex
• Norfolk
• Northamptonshire
• Nottinghamshire
• Northumberland
• Oxfordshire
• Rutland
• Shropshire
• Somerset
• Staffordshire
• Suffolk
• Surrey
• Sussex - covering East and West
• Warwickshire
• Wiltshire
• Worcestershire
• Yorkshire - covering West, South and North Yorkshire

Scotland:

• Aberdeenshire
• Argyll
• Ayrshire
• Berwickshire
• Bute
• Banffshire
• Caithness
• Clackmannanshire
• Cromartyshire
• Dumbartonshire
• Dumfriesshire
• Elginshire or Moray
• Edinburghshire or Midlothian
• Fife
• Forfarshire or Angus
• Haddingtonshire or East Lothian
• Inverness-shire
• Kincardineshire
• Kinross-shire
• Kirkcudbrightshire
• Lanarkshire
• Linlithgowshire or West Lothian
• Nairnshire
• Orkney
• Peeblesshire or Tweeddale
• Perthshire
• Renfrewshire
• Ross-shire
• Roxburghshire or Teviotdale
• Selkirkshire or Ettrick Forest
• Shetland
• Stirlingshire
• Sutherland
• Stirling
• Wigtownshire

Wales:

• Anglesey
• Brecknockshire
• Cardiganshire
• Caernarfonshire
• Carmarthenshire
• Denbighshire
• Flintshire
• Glamorganshire
• Merionthshire
• Monmouthshire
• Montgomeryshire
• Pembrokeshire
• Radnorshire

Northern Ireland:

• Antrim
• Armagh
• Derry/Londonderry - that's above my pay grade
• Down
• Fermanagh
• Tyrone

Channel Islands:

• Alderney
• Guernsey
• Herm
• Jersey
• Sark

Other:

• Falklands
• Gibraltar
• Isle of Man