The Middle Saxons- that is, between Essex, Sussex, and Wessex

- and now all part of London (though you still specify the county as Middx in your address). Wembley (football) and Harrow (posh school) in NW London, aren't really far out at all, but they are Middlesex rather than London addresses.

And here's a link to previous Sussex & Essex stuff (courtesy of Bill again):
http://wordsmith.org/board/showthreaded.pl?Cat=&Board=words&Number=76205