No year of publication given, but from clues in the text I reckon about 1968:
"Some idea of the vastness of the municipal undertakings may be gathered from the fact that in the twelve months from 1st April 1968 the Corporation expects to spend on revenue and capital account some £173,000,000 and yet, for the wide range of services provided, the rate for the year of 13s. 4d. in the pound cannot be regarded as excessive."
(When did the word "Corporation" disappear from everyday use? I remember Corporation buses in Portsmouth in the 1980s, and the word sounded old-fashioned then - it was an *old* person's word).