The few reviews on the IMDb seemed to like this, but I got bored with it very quickly. Meek man's go getter better half comes out of a mirror when he looks at it on one occasion and peps his life up, so we have two of them running about with the hope that someone doesn't catch them together - that sounds crap now I've typed it, but there you are.
I did delete it after 20 minutes but got it back a week later to see it to the bitter end. Supposed to a comedy but didn't make me laugh once, and the only interest/surprise was to see Alastair Sim dressed up as a Sikh, complete with turban and dark makeup, which was a bit disturbing.
One of the films in his early career I think he would rather forget.