Inspector Hornleigh Goes to It (1941).

Alistair Sim in
Inspector Hornleigh Goes to It

In this film, Scotland Yard's Inspector Hornleigh (Gordon Harker) and his somewhat bumbling sidekick Sergeant Bingham (Alistair Sim) are on the trail of Nazi spies when murder occurs. This film is the third in a series (Inspector Hornleigh, 1939; Inspector Hornleigh on Holiday, 1939).