Hi Alva
Not sure by what you say what sport he was actually taking photos of. I say this because, if it was not a 'mainstream sport' e.g. football, then he could have been a freelancer during the time frame given.
If on the other hand he was employed, then, although I don't have any connection with London, it might be worth your while looking at the Evening Standard sports pages at a library,
or others such as the Guardian etc. As a longshot, if he was employed you might want to consider writing to the National Union of Journalist (NUJ) to see whether he was a member and could shed more light on it for you.
failsafe
