Meanwhile - on another matter! My initial investigation of this noise centred around the exhaust and I found that it was almost parted, just in front of the join with the back box - and also split just in front of the cat. The part is mega-expensive from Cit and not cheap from exhaust factors - however my garage identified that the frontpipe for the non-cat Turbo diesel will fit, as long as the machined mounting ring at the front end is cut off and replaced by the one from the old pipe - different turbo flange. The result is excellent - motor revs more freely, feels faster and is 3-4 mpg more economical. Well worth doing - even after paying half an hours labour to change the flange over, it still saved me almost £200 on the cat pipe... and the car is better as a result. Still jingles, though, dammit!
So it's a choice of clutch (citroen £233), exchange compressor £250 or s/h £65 
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