Hi Anita, good to see full refs given, much easier to check :-) Sadly so far I can add nothing that you do not already have, I see you have discussed the BS element. Its possible that his father was in the military but there were many workers who went overseas to work and seek a better life, I have checked as many avenues as I can think of with regard to the UK but sadly theres not much in the way of online information regarding the West/East Indies for BMD etc. Not sure a death cert would tell you much, the age on that reg is wildly out to his previous ages given (although given by the informant who may not have known), there would almost certainly be nothing on the cert to give more clues to his origin, there were no birth places or parents listed then. I'll give it some thought but cannot think of anything as yet that may help you.
NJO in Cornwall (UK)