It's fine. Julian Wadham is no Stephen Fry, but he brings his own qualities to the part, and I really like the Minister's companion, though she seems a little peripheral at times.
If you've heard Death Comes to Time
, some of the story beats are a little too familiar, I think, but it's worth your while. The casting is great!
You can see my reviews here if you're interested: http://unreality-sf.net/tag/the-minister-of-chance/