How many movies have Ian Hogg and Ian Richardson acted in together?

They have worked on 2 movies together! Their first movie together was The Persecution and Assassination of Jean-Paul Marat as Performed by the Inmates of the Asylum of Charenton Under the Direction of the Marquis de Sade (1967) and was their highest rated movie together. They have not worked together since All's Well That Ends Well (1968).