It is very intriguing (I think both of us got it right!). As I mentioned, the book was written in 1962 and set in 1950, but it has an oddly contemporary feel to it with its cheerful, bawdy and yet poignant approach. At the time of its publishing, it became an immediate bestseller in 19 countries, but has had just one reprint 5 years after the first publication and is very hard to find now. Also, I cannot believe that no one tried to make a film out of it although the plot was simply crying out for it. All that makes me wonder whether 'certain forces' suppressed any further publicity to avoid offending the British Royalty.
I think this link might explain it. It is an extract from 1965:
THE CONSORT by Anthony Heckstall-Smith. 181 pages. Grove. $4.50.
"Should they really have banned this story?" asks the book jacket. Well, nobody really did. After printing several thousand copies of this ribald and frisky little fantasy of royal family life, the British publishers accepted the anguished advice of their barristers and chickened out.
Although Author Heckstall-Smith halfheartedly twists a few facts, there is never any doubt about who his consort is meant to be. After all, how many royal consorts are there who are handsome and charming, notoriously impatient with stuffy protocol, and married to serious-minded queens who love horses and receive government documents in red dispatch boxes? If there was any doubt, the publishers archly turned out the book with two jackets, the outer showing the consort with his queen in full British-style ceremonial robes, the inner replacing the queen with a lush brown maiden.