Well Heinz, I've tried to adjust the rears as you suggest. Passenger side fine, but the drivers side... no chance on mine. I just about got my left hand on the adjuster, but then got cramp with my hand and arm wedged between the wheel, floor and exhaust... bl***y painful trying to get my hand out

so I had to revert to removing the wheel. Car now back at 2F:1R for comfort, and

likely to remain there.