Michael,
Bought mine off a guy called Mike over Melton Mobrey way, he ran a site called Cut40.com but thats gone now.
Did a bit of searching and this looks to be the same guy.
**LINK**
Looks to have moved from home and set up in a unit. Collected mine and paid extra for 2 year warrenty but they are building this in now.
They say 12mm for this one which is a newer version of what I bought, looking at consumables mine has now been downrated to a Cut 31, still pleased with it but things move on
Very impressive setup where they can test under load, not just box shippers. They also repair these and other plasma cutters plus the AC/DC Tig units which is nice to know because these are full of electronics and you could spend more than a new one replacing boards..