A smiling PRINCESS MARGARET (left) chats to PETULA CLARK, the world-famous songstress and the immensely popular comedian, FRANKIE HOWERD, in the foyer of the London Palladium before the start of the Royal Variety Performance, in aid of the Variety Artistes' Benevolent Fund. It was a surprise appearance for Comedian Frankie Howerd, who was standing in for Eric Morecambe, recovering from a heart attack. Also attending the performance were, Queen Elizabeth, the Queen Mother, accompanied by Princess Anne, Prince Charles and Princess Margaret's husband, Lord Snowdon.