The Counterfeit Constable

is a 1964 French comedy film directed by Robert Dhéry and Pierre Tchernia and starring Ronald Fraser, Diana Dors and Arthur Mullard.

[1] A French rugby supporter, in England for a match at Twickenham, is accidentally elbowed in the face and loses two teeth.

He goes to the dentist who fits new teeth and tells him he musn't open his mouth for two hours, to allow the cement holding them to set properly.

He tries it on for fun, and while wearing it by sheer chance he saves Diana Dors, a movie star who lives next door.

And to make matters worse he needs to return home to France urgently as he is due to be married.