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Stuart Turner P5LY No.13611 was Supplied to Fairmile Marine on Jan 19 1944 as part of a set comprising two engines and a 1.5 KW dynamo on a combined base. It was one of a batch of 100 such sets (or engines - not sure which) - Fairmile, designers and manufactures of Motor Launch, Motor Torpedo Boat etc 'kits' for assembly in yards around the UK, must have been laying down quite a few craft in early '44 - can't think why ;-)
Note Best and Loyd oil pump so that engine could use fuel from main tanks rather than petroil, and flame trap on carb - probably quite an important consideration on a wooden vessel carrying several thousand gallons of aviation spirit! Though S-T generator sets were commonly started by motoring the dynamo, it is strange that there is no apparent means of hand starting the engine in an emergency.