In message , David
Cantrell wrote:
The first part of the postcode is used to direct mail to a local sorting
office.

That was never the case, though I think that originally all destinations
with the same outward code (the first part) went to the same office. But
many outward codes might go to the same place. Nowadays there's no need
for that simplification and it is no longer applied - an outward code
can be split between sorting offices if operationally convenient.

The second part of the postcode directs mail to
an individual postie's round,

The inward code (the second part) directs to a specific street or part
of a street. There are never more than 80 individual "delivery points"
(e.g. houses) in a given code. One round will contain many codes (which
might not all be in the same outward code); the idea is that rounds can
be reorganized without having to recode anyone.

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Clive D.W. Feather | Home:
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