Just a little note to add some local interest to this excellent movie - the action takes place at an unnamed Air Sea Rescue station - I am sure most of the interior shots were taken in the studios but the exteriors are from Felixstowe where there really was a real life A/S Rescue station during WWII. The German guns were actually at Landguard Fort, which was just around the spit or point from the A/S Rescue station itself. The shots of the railroad station are likewise taken in what was then Felixstowe Town station. The area where the A/S Rescue station was is now part of the Container Port and I am sure nothing remains of the hangars and docks, but Landguard Fort is still there, minus the guns.