Just watched this.

Pleasantly surprised.
Full of wry, dry humour that only the Brits can do so well.
Nicely paced and directed, although goes slightly off the rails about 2/3rds into the film, picks up towards the end.
Monochrome does not detract from the movie in the least, in fact I find it somewhat refreshing.
For a largely unknown (to me at least) cast, they all put in a reasonable performance, with the Clancy character perhaps being a little weaker than the others.
For the deadpan laughs, good direction and editing, I'm generously giving this one 8 out of 10. Everyone involved in it's production have nothing to be ashamed of at all.

Cheers
Osmooms