^^ Well he also chose to leave TGW because at the time his wife was having their second daughter, so he wanted to be closer to home. Then he was on Downton Abbey so I think he left TGW at a good point where they couldn't ruin what we did have of him there.
Matthew has joined the cast for a new film Starring Helen Mirren, and Jim Broadbent, called "The Duke".
It's not yet listed on his IMDb page but was released in the linked article:
‘The Duke’: First Look At Jim Broadbent & Helen Mirren In Art Heist Story
Matthew previously worked with Jim on the film "A Sense of an Ending", released in 2017.