The space in the STD codes
The attached page is from the London Dialling Code Booklet for 1968 which I found online. The relevant STD codes had the space after the 4th digit, e.g. Ackworth is shown as 0977 63, whereas in later Dialling Code Booklets from around 1970 onwards it would have been shown with the space after the 3rd digit i.e. 097 763, as would all similar codes.
The space after the 4th digit would have made more sense to me as Ackworth was effectively Pontefract (0977) followed by 63. The Post Office, who ran the telephones then, must have made the decision at some time to change the spacing of the STD codes. Does anyone remember why?
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