On 24 Sep, 20:24, Basil Jet wrote:
It has been stated here many times that the postcode system was devised
purely for Post Office convenience, however, HA5 contains two roads
called Pinner Road at opposite edges, and I can not see why the PO would
have viewed that as convenient when they only had to move one of the
boundaries by 100 yards to put the Pinner Road which straddles the
Northwood boundary entirely into Northwood where it belongs IMO.

I suspect that example is down to postmen's walks and the split
between the Northwood and Pinner delivery offices.

Stuart J