An interview with Peter Sellers for Dr. Strangelove where he does several different English accents:
1) Cockney. 2) General London accent. 3) Estuary English accent (intellectual). You might hear this in parts of Kent and Essex, maybe Surrey, sounded quite Kentish. 4) Pimply guy (?) Frank Spencer! 5) Posh (Cosmo!) sort of London accent 6) Maybe a Greek or Jewish London accent, 7) Edinbro’ Morningside Accent 8 ) Glasgow 9) West Country (but as someone pointed out John Arlott was from Hampshire, and has accent has a kind of rural South East feel (with a bit of a burr).