How much would you charge for a clutch change on a Rover 200 (R65 box).

It's all stripped down, all that needs to be done is drop the box, swap the clutch (which I have) and put the box back on again.

I've tried to do it myself (hence it all being stripped down), but I could no for the life of me undo one of the lower engine to gearbox bolts and the subframe/exhaust were stopping me getting any leverage with a breaker bar, and small wrenches had no effect . . .