[Peter Clare]

Air Britain Serials BA100 - BZ999 gives the following information :-

BX135 - 434
300 Bell Airacobra 1s
Diverted to USAAC (187) and Russia. No RAF service use.
In this publication I could not find that the serial BW330 was used.

British Military Aircraft Serials by Bruce Robertson gives the following :-

BX135 - 434
300 Bell 14 Airacobra 1
Majority taken over by USAAF and others shipped to Russia, at least 17 were lost at sea.
Once again no mention of BW330.

Regards
Peter Clare