Stif in Leeds.
I've a pair of their disc wheels that are still going strong after 8 years of abuse on a fully rigid Pace (roots, rocks, black graded MTB centre trails etc several times a week) and then on assorted hard-tails.
Apart from 3 fatigued spoke heads (too many side hops around bends or up curbs) they are still true. On their second ride, I hit a rock so hard that I folded the rim bead over so far I had to use pliers to open it to extract the tire bead. But they didn't taco.
I've used Kendells in Castleford a good few times too.
And done my own, which still run true (and save money).