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Ken
Yugoslavia was occupied by the Germans and Italians in 1941 and numerous Yugoslav naval ships escaped to join the allies.
The submarine 'Nebosja' escaped to Alexandria,in Egypt and joined the British. She was incorporated in the 2nd Submarine Flotilla, later shifting to the 3rd Flotilla. I would think that she would have had a few RN onboard to help with liaison duties.
She returned to Yugoslav control in 1945