Quote:
Originally Posted by Scott37
Thanks, but I think you may be referring to a later era. The list I posted shows codes which - after converting letters to numbers - start with all sorts of digits. Could it be that this list applies only to Director areas? If so, did other exchanges have lettered local codes? How did the system distinguish between code starts and number starts?
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Before the introduction of 'All Figure Numbering' (AFN) in the mid 1960's, the 'letters' were dialled which obviously have a numeric equivalent. Once AFN came in, the same codes were dialled but with the numeric equivalent being quoted. Thus 'UX' for Uxbridge became '89' or 'CU4' for Cuffley became '284' . However over time as the length of the numbers on these exchanges became longer, the codes would be changed by becoming shorter to keep the same seven digit long numbers.
Around that time, London had 'sectorisation' were the exchange names were done away with and the first three letters (or their numeric equivalent) replaced with a different three digits - thus WHI (944) became 930.
All helps to confuse the issue
