I've done a bit of digging, and I'm pretty sure it's the Radio1 One Big Weekend in Sunderland you're talking about 08/05/05. It had the Shapeshifters playing.
The audio isn't on here (although if it was, it would probably only be Jules' set, I suspect you would like the whole day!), but Jules' tracklisting is here.
The Radio 1 page for the event is here.
Hope this helps a wee bit.