You can go ahead and fly over without a work visa....but anybody who
does this should be informed enough to know you don't tell UK customs
that you're there to DJ etc which I imagine Bone probably did. I
learned that the first (and only) time I flew direct to the UK and was
nearly denied entry. Arrived with $300 in my pocket and no phone
number for anyone.."Just here to hangout with friends" I said, whilst
towing 150 pounds of gear. They were aghast. Thankfully Alex Bond was
there to pick me up and diffused everything. And thankfully it was at
the Manchester Airport and not in London.