When did london code change from 071/081 to 0171/0181 and to 020?

Question

When did london code change from 071/081 to 0171/0181 and to 020?

Answer 1

Early 1990's.

Answer 2

Yeah I remember when I lived in London in 1994 it was 0171 (or 071, can't remember now!).... I think maybe around 1999 I was told that it had changed to 020

Answer 3

The change from 0171 to 020 7 was in 2000:

22nd April at 1am you could start using 020 - Financial Times (London); Apr 22, 2000; p. 03

At midnight on 14 October 2000 you had to stop using 0171 and 0181. The Independent (London); Oct 14, 2000; Charles Arthur; p. 13

The change from 071 to 0171 was on "PhoneDay" on 16 April 1995 - The Independent (London); Apr 15, 1995; MARTIN WHITFIELD

Answer 4

I remember when it was 01 and changed to 071 and 081