Chitty Chitty Bang Bang - where was the beach location?

The beach scenes in Chitty Chitty Bang Bang are set on and around a beach where an island is joined to the mainland by a narrow sandy beach.

Does anyone know precisely where this beach actually is?

It looks like the south-western coast of the UK, but it coulkd easily be elsewhere I suppose.

Nope, south-eastern coast of France; specifically Cap de Camerat near St Tropez. At least according to this person it was.