Hi Timex,
apparently the Navy watches ( 0552 stores numers on rear) are fairly well documented, it's the lesser known about watches supplied to the army air corp he's looking into ( same physical watches though) these carry a W10 stores number.
I guess they could have been issued as pilots would be in splash down gear, but a specialist divers watch to pilots seems odd to me, but then the MOD never made any sense to me.
There is a common 'possible myth' in the watch collecting circles, that these W10 watches actually went to SAS and Rolex just say AAC to be all cloak and dagger but that sounds like serious wishful thinking to me.