Thanks for the replies - already I'm getting a better idea of what he did. It sounds therefore that he was Ops Officer. So, was there more than one Ops Officer? I'm assuming so or else how did they cover leave.
My regret now is not asking him more questions when he was alive but as a twenty-something I was more concerned with getting a job, my car and my girlfriend.
So I wonder what the "voluntary work" was? I'm wondering if it's anything to do with Giant Voice? I've been reading about the Vulcans success in '74 which was during the time he was there and just before he got his MBE.
Amongst his log books and pilot notes (that I still have) there is a brochure with a cover which I think (I can't look because I'm at work) is Giant Voice 1972 or '73, which I believe was an RAF competition. I'd been told that he'd picked that up off a coffee table when it was left behind and he'd taken it home or something like that but I could be wrong.