One for us northern types, check out the regs as they are particular about tyres. You'll also need to have an ACU competition license or trials registration card and be a member of an ACU affiliated club which includes the TRF.
http://www.durhamdalesclassictrial.co.uk/#!downloads/c188k
http://www.durhamdalesclassictrial.co.uk/#!downloads/c188k