I'd love to play Descent with 3-d floor tiles. Any ideas if there are UK sellers of such items ? If not...what do you think the chances of them arriving from the US intact are?

International shippings is about 15 US dollars (about 10 pounds), but www.hirstarts.com produces the molds to make Descent dungeon tiles. All you need is two molds, some plaster, some cork board and a bit of paint.
http://www.hirstarts.com/cavern/descent.html is where you find the instructions to do so.

if you dont want to cast your own i know someone that is willing to makev them for you i could get his email for you if you would like to see what he all has