Update1. Dropped oil & water from engine, both looked good with so sludge or separation. Redex put into & left to soak in cylinders. Engine turned by hand very slowly & bit by bit over several days - all seems smooth, quiet & well. Have taken bonnet off as gives such good access to engine bay. New timing belt, power steering & alternator belts fitted, all reassembled & filled with new fluids. Had a really good look at most engine components, taken lots of bits off to check them, all looking good. Worked on front discs which had surface rust on them, all cleaned & looking like a new pin. No problems with parts from BMW, all bits so far delivered the following day & surprisingly not too expensive! Only using genuine BMW parts to maintain originality. Next step is to turn engine on starter motor with no fuel or sparks to pump some oil around. Maybe tomorrows job. Cheers