"Paul Terry" wrote in message
...

Just to add to John's reply, London numbers starting with 020 3xxx are
due to start being allocated this summer. Unlike 020 7xxx and 020 8xxx,
they will be assigned on a London-wide basis and will not be mapped to
any particular district within London.

Which, AIUI, was supposed to be the case with unallocated 7xxx and 8xxx
series numbers post-020 implementation - certainly what we were told prior
to the change was that it was merely to simplify the mapping exercise that
it was decided to use distinct number series for former 0171 and 0181
numbers and that the distinction between 'inner' and 'outer' London would
disappear, the two series (and subsequently others) becoming 'common user'
post-translation.