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One such chef is Chantelle Nicholson, owner of Mayfair restaurant Apricity, who has paired the soap with mushrooms and wild garlic.

In March 1975 Miss Stratford had been Girl of the Month on the front cover of Mayfair magazine, an adult magazine for men.

The Playboy club opened on Park Lane, Mayfair, in 1966, and many of the girls who worked there were singers or aspiring actresses or models.

Ms Magnussen and Mr Abdulhak both studied at Regent's Business School in London, and in the early hours of 14 March, 2008, were together at the exclusive Maddox nightclub in Mayfair celebrating the end of their exams.

The ring, which dates from the late 12th to early 13th Century, will go under the hammer at Noonans Mayfair on 26 March.