As someone who has never seen an episode of the television show, I actually found 'Dad's Army' watchable. However, what lets this down is the plot which is extremely boring; all thanks to the film itself.

They reveal the eventual plot twist to the audience incredibly early on, so you spend the vast majority of the film just waiting for the penny to drop for the characters - which takes a long time. They needed to keep it hidden for longer, or at the very least attempt to throw us off the scent.

I quite like the cast in this, with a few famous names alongside some of the UK's lesser known but still recognisable faces; mostly from TV. Toby Jones, Bill Nighy, Catherine Zeta-Jones and Michael Gambon fall into the former category, they are all fine though you can tell they are far from their best. I did enjoy the ongoing gag of Jones resembling a certain former British prime minister, though.

A more intriguing premise and I would've rated this slightly higher, but alas it is too dull.