When The Kissing Had To Stop by Constantine FitzGibbon

England was on a long, long spree.race riots and gang wars were daily events; the naked girlie shows boomed; crimes of lust made the streets unsafe; husbands smiled at wives' adulterous affairs; wives were intimate with their husbands' mistresses. England's Prime Minister was a ruthless man with a driving urge for power. He did not hesitate to exploit this situation for his own, twisted ends--even if his success meant catastrophe for his country and his allies!

[The Encyclopedia of Science Fiction and Fantasy, page 171 'A communist-backed politician seeks to rid Britain of U.S. nuclear bases, in order to form a dictatorship. Depicts a decaying society strangled in its own forms and formalities'].