In message , at 23:47:49 on Thu, 5 Aug
2010, Tim Roll-Pickering remarked:

I wouldn't be surprised if other post codes reflect the use of rail at
the time and don't bear the best relation for how other companies
deliver services - e.g. insurance where premiums vary quite a lot on
either side of the London post code boundary for no reason other than
that.

All kinds of effects like that kick in, even when two properties can be
almost neighbours, but are thought of quite differently because they are
in different postcodes.

I used to live in Hinchley Wood, which is on the "edge of London", and
it was quite instructive to see a range of businesses deciding whether
by implication it was a property which would naturally look "inwards"
(to Surbiton/Kingston) for its services, or "outwards" (to Surrey).
--
Roland Perry