Airframes
Benevolens Magister
Sounds logical. Most American aircraft in British service retained the U.S. harness, if it was a full harness, although there was at least one exception I know of, in the Fleet Air Arm, where Sutton harnesses were fitted to Avengers on arrival in Britain. Certainly such types as the P51 and B25, in RAF service, stayed with the US full harness - no point in changing.