Miss X was a pseudonym used by actress Joyce Blair
(sister of the infamous tap dancer, TV parlour game contestant and all-round family entertainer, Lionel Blair). Her saucy single, "Christine", was banned by the BBC as it was suspected to refer to the
(then recent) Profumo affair.
The Profumo Affair was a 1963 British political scandal named after John Profumo, Secretary of State of War. His affair with Christine Keeler, a London call girl, the reputed mistress of an alleged Russian spy, followed by lying in the House of Commons when he was questioned about it, forced the resignation of Profumo and damaged the reputation of Prime Minister Harold Macmillan's government.