Thanks for the quick replies lads.
Much as I suspected, contractor talking through his ******** at 10 bar or greater!!
I'll ask the question though Geoff, should be interesting to see what he comes up with. Probably something like " Well you're 500ft up in the Pennines, therefore as the ambient pressure is reduced you'll need a greater driving pressure to achieve the same torque" or something along those lines.
PS anyone reading this - the last statement is rubbish and should be taken with a pinch of salt - or a shovelful of grit (topical observation)
Brian
