Re: Short address

On Sat, 29 Sep 2007 19:55:53 GMT, Ronald Raygun put finger to keyboard
and typed:

Mark Goodge wrote:

On Sat, 29 Sep 2007 10:24:01 +0100, Tiddy Ogg put finger to keyboard
and typed:

all you need here is your house number and postcode.

That's not always true, because sometimes a postcode can cover more
than one street. So the house number isn't necesarily unique within a
postcode - you do need the street name as well in order to be certain.

I take exception to the "So".

Although a postcode might cover more than one street, this does not
necessarily imply that a house-number/postcode pair might fail to
identify a house uniquely.

For instance, a particular postcode might cover 20 houses which lie in
3 different streets. I put it to you that the boffins who allocated
the postcodes will have ensured that no two of these 20 houses share
the same house number.

No, they won't. Postcodes are more likely to cover more than one
street when at least one of the streets is very short, so there's
quite a strong likelihood of duplicate numbers in such cases.

In any case, postcodes are allocated for one purpose only: To assist
with delivering the post. There are no other considerations taken into
account; avoiding duplicate numbers is certainly not part of the
criteria.

The sort of thing I'm thinking about is that TT1 2XY might cover
even numbers between 20 and 50 of Main Street, Toytown, and also
all 6 houses (numbered 1 to 6) in The Lane, Toytown, being a small
cul-de-sac off Main Street, on its even-numbers side, somewhere
along the range 20-50. So the only numbers which can be paired
with TT1 2XY are 1,2,3,4,5,6,20,22,24,...,48,50, and clearly any
of the first 6 must be in The Lane, and any of the rest must be on
Main Street.

But if TT1 2XY covers houses 1 to 20 of Main Street, and The Lane is a
cul-de-sac in between 5 and 7, then all six houses in The Lane will
have the same postcode and house number as a house in Main Street.

Mark
--
http://www.BritishSurnames.co.uk - What does your surname say about you?
"All the promises we break from the cradle to the grave"
.

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