1971 Census Appendix 12 (viii)

Expanded area code

New towns

Aycliffe

Basildon

Bracknell

Corby

Crawley

Cumbran

Harlow

Hatfield

Hemel Hempstead

Peterlee

Stevenage

Welwyn Garden City

Skelmersdale

Telford

Milton Keynes

Newtown (Powys)

Northampton

Peterborough

Redditch

Runcorn

Warrington

Washington

Central Lancs.

Space 

Not a new town