Bill Warren wrote:

In MIDNIGHT LACE, Williams plays a character similar to his role in DIAL M FOR MURDER, but they have different names, so I assume they're different police detective-inspectors.

To obviate any further confusion, Williams played Chief Inspector Hubbard in Dial M . . . and Inspector Byrne in Midnight Lace. They were however the same pea out of two different pods. It's a pity there couldn't have been a TV series built around the character, whatever it was called.