How many movies have Sonia Markham and William Hartnell collaborated on?

They have worked on 8 movies together! Their first movie together was Doctor Who: The Dalek Invasion of Earth (1964) while their highest rated movie together was Doctor Who: The Time Meddler (1965). They have not worked together since Doctor Who: The Time Meddler (1965). They are most known for their drama films together.