Dr Turner's condition, which also afflicted comedian DudleyMoore, also left with her with badly slurred speech, and she had some difficulty swallowing.
Though clearly not to everyone's taste, the likes of Peter Cook and Dudley Moore's Derek and Clive sketches and George Carlin's Seven Dirty Words routine have influenced generations of humorists.
Regarded as one of the nation's most acclaimed and fiercely intelligent directors, Sir Jonathan made his name with Peter Cooke, DudleyMoore and Alan Bennett in Beyond the Fringe in the 1960s.