How many movies have Niall O'Brien and Niall Tóibín acted in together?

They have worked on 6 movies together! Their first movie together was Ryan's Daughter (1970) and was their highest rated movie together. They have not worked together since Who Bombed Birmingham? (1990). They are most known for their drama films together.

Role
Det. Insp. Isaac Gissing
Role
Reverend Coot