"Meanwhile, Back at The Abbey - Matthew . . . "
Matthew died several seasons ago. And is still dead. If you're hoping to see him again . . . you're fighting an uphill battle that has already been lost.
When the film was first announced a year ago . . . there was this hilarious comment stream about how they should have Matthew be part of the movie. Nope. He's dead. And his lovely widow has remarried. And they're expecting their first child. And also, Matthew died. On screen.
Those are just the facts.