Wiggle sell them - http://www.wiggle.co.uk/ProductDetai...dID=5360011547 -haven't looked beyond that for a dealer with one for a test ride.

Good point about the tyres - the XP is so expensive that it isn't at the top of the list, pushed from that spot by the likes of the P8 and Mezzo. Brompton probably in 2nd due to price with XP in 4th after Birdy.