Pretty much can't buy new in the UK, I got a few pump kits from ANSgear recently, 5 cheap ones ran me at about £30 each all in once postage and duty had hit. If you're looking at pump kits I think
@Gee Tee mentioned the economy CCM ones (much nicer than the cheap ones I got from ANS) ran him at about £50 imported direct from them.
I recently got a benchmark slider with a cut trigger guard for $28 all in from:
www.baccipaintball.com
Only 5 days door to door as well despite coming from the USA to the UK.