Sylvia Dillane

Sylvia Dillane was chairman of the North Sea Boating Club. She was killed by the Slitheen family (assuming she existed in reality and not as an alias) and was used as a disguise for one of them. This Slitheen was called to 10 Downing Street to join with the other Slitheen. When Mickey Smith launched a missile at Downing Street, the Slitheen was killed. (TV: World War Three)