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Re: BT codes over layed on Map
It may be inefficient, but it's very logical (or at least, used to be before the 011 and 02 codes were introduced).
For example, Saffron Walden was 0799. If you look at the letters on your phone keypad, you'll see S is 7 and W is 9. Hence, 0 for non-local, 79 for SW, 9 because it was the 9th area with those letters. Similarly, SWansea was 0792 and SWindon 0793. CArdiff 0222, CAmbridge 0223. GUildford 0483, HUnstanton 0485... etc...
The exception to this was the letter O, which became the number 0 in codes - so NOrthampton was 0604.
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