T’is worth shoving the word ‘Glastonbury’ into YouTube. You can turn up all sorts of vintage performances. And The Seahorses doing ‘Love Is The Law’, back in 1997!
One other thing. I noticed that Dermot O’Leary’s Saturday Show on Radio 2 has spawned a compilation album full of live performances recorded for said broadcast. It has to be said that it is overwhelmingly average with one notable exception. That exception is a quite brilliant ska take on ‘Everybody’s Changing’ (the Keane tune) by Lily Allen. Genius, I promise.
EDIT: Oh, just found a slightly shite quality version with a truly terrible video on YouTube. Presumably the shitty video was made so that they could simply upload a cracking tune. Enjoy.