How many movies have Frank Thornton and Joseph McGrath collaborated on?

They have worked on 4 movies together! Their first movie together was 30 Is a Dangerous Age, Cynthia! (1968) while their highest rated movie together was The Bliss of Mrs. Blossom (1968). They have not worked together since Digby, the Biggest Dog in the World (1973). They are most known for their comedy films together.