New phone numbers for London
| date: 1 Jun 1999
As of today, June 1st 1999, the new 020 phone numbering system will be switched on, and London once again will have a single dialling code. 020 will be followed by either a 7 or an 8 depending on the area.
So from now, you can start using our new TDV number - 020 7543 1700. However, the old number will continue to work until 15 October 2000
Full details can be found at BT's site