wrote on 07 August 2010 22:50:20 ...
In articleFAj7o.78929$RO5.57792@hurricane, (Roy
Badami) wrote:

On 07/08/10 20:35, Peter Smyth wrote:

It is the post towns with (N) after them in this list

http://abcounties.co.uk/bpa/bpasection3.htm

Generally seems to be towns with the same name as the county, plus
other towns deemed large and famous enough to not need a county.

Thanks - that's exactly what I was looking for!

Except that it's total oblox in the London postal districts. I was brought
up in Putney and no-one but no-one has referred to that as being in Surrey
for over 150 years.

Nevertheless the list is correct in that (a) Surrey is the traditional
county name for Putney, (b) you don't need to put it in the address in
addition to "London", and (c) Royal Mail won't mind if you do include
it, though it sounds as if that's about to change.
--
Richard J.
(to email me, swap 'uk' and 'yon' in address)