Why is my Hope XC freehub locking when the quick release is tightened?
The cartridge bearings in the freehub body were worn. Actually, only the one nearest the hub body was jammed. I've obtained replacements and all is well again. It was a relatively simple (though noisy) job to bash them out with an old screwdriver (remember to remove circlips first - a circlip tool came in handy).