We're off on hols soon so I was going to check the wheel nut tightness with my torque wrench - small problem I don't have a socket that will fit. Not as obvious a solution as it initially sounds. I think it's 21mm but it looks like it needs a thin wall socket or is it just an awkward bailey size before I go looking and trying loads at a shop and annoying the staff asking to try individual sockets 1 at a time.