If I was you, I would do it on the divide between the equipped and unequipped ('raw') categories in modern powerlifting, and possibly incorporate something to do with the laxity of most equipped federations regarding depth of squatting, etc. as a result. It is an issue that is on the forefront of the sport at the moment and is really dividing it, so might be worth looking into. You'd want to be somewhat interested in powerlifting though.
Or possibly something to do with the state of British weightlifting at the moment and the fact that you have very few decent lifters, and that there are actually British sprinters who can lift more on the olympic lifts than some guys on the British weightlifting team. This could be good because the Olympics is coming up soon and it's in London obviously so it's very relevant.
Or an old cliche, steroids in bodybuilding?
EDIT: I just re-read your post and noticed that you said "social
aspects" in sport, which sort of nullifies all of my suggestions. Hmm...
post edited by CitizenKane - 2011/03/23 17:42:50