It seems a pity not to document the many area PhotEx has expertise in, so I've started this thread for the purpose. I'll open the bidding with Naval Historian. This was his response when asked what his expertise in the field was...
Further examples of our resident polymath's expertise welcome.If I cant be bothered to go and do the research myself, I ring up the RN Historical Branch or the appropriate archive and get them to do it for me. And if we want to play tops trumps, I have some of my work in the national archive as documents of record.