That was written in 1945, in the report Towards the Conversion of England. At the time the Church of England had 17,000 full time clergy. They were all men, so if they'd had men and women responding to vocations in similar numbers as today there ought to have been about 30,000 of them.
The Church of England is currently looking to a future where it operates with 5,000 full time clergy, perhaps only two-thirds of whom will be men, representing a decline in that constituency of 80%. The population, meanwhile, has risen by a few million.
Thank heaven for parish administrators, is my first reaction!
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