How many movies have Alain Lionel and William Douglas-Home collaborated on?

They have worked on 3 movies together! Their first movie together was Emmenez-moi au théâtre: Le canard à l'orange (1979) while their highest rated movie together was Le Canard à l'orange (1993). They have not worked together since Ne coupez pas mes arbres (1995). They are most known for their comedy films together.