I disagree that this is a poor film. In my opinion, "Marriage of Convenience" is one of the stronger "Edgar Wallace" films. Harry H. Corbett is well cast as the customary police officer, although I wasn't so convinced by John Cairney being cast as the villain. The story is quite routine but still watchable.
Even so, the pace is good, there's a bit of incident and it's a black and white British film!