Can anyone recommend a decent set? I’ve get a hard to access 21mm nut and my normal 1/2 ratchet is just too awkward and slips off. Would a 12 point vortex be any good or should I stick to 6 point? Or any other ideas like some sort of flexible ratchet head?
Hard to guess which would give better access without knowing what you're trying to work round, but if you're having problems with the socket slipping off then I expect a 6 point would be less susceptible to that.