Probably still BSA, like the Army version. The generator is a 4-pole one, so conversion from 15 to 30 volts is simply a matter of connecting the brush sets in series rather than parallel. The power output is "nominal" anyway, so the Air Ministry rating may just be normal variation. (The RAF would want to charge 24 volt batteries later in the war as aircraft radios went from 12 to 24 volts to allow for more power (and engines required more torque to turn them over) without having to rewire the system with thicker cable.)
(I can't remember what the "Trolley Acc" used for aircraft starting had as a generator - something by Arthur Lyon & Co. (ALCO) with a 129cc JAP[1] petrol engine - that used the JAP 3 engine and was rated at 360 watts (20 volts at 18 amps). The earlier (JAP 2A) version was similar as far as I know.)
Chris.
[1] J.A.Prestwich Industries.
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