How many movies have Alan Perry and Ed Bishop collaborated on?

They have worked on 3 movies together! Their first movie together was UFO... annientare S.H.A.D.O. Stop. Uccidete Straker... (1972) while their highest rated movie together was This Is Supermarionation (2014). They have not worked together since This Is Supermarionation (2014). They are most known for their science fiction films together.