Ok, as an update. My friendly garage man in Brunswick had the car in today and I'd also done my research on the compressor. As prn31 has said, sometimes when it fails the actual compressor does get metal fragments in it and this eventually leads to failure. There's no easy way of checking if the compressor has failed (I believe) so for those who want to try the quick fix it would make sense to order it and give it a go.
I had a look at mine when it came off and the model number was 1K0 820 859Q so from what I've seen this was a later model. However it was also used across quite a few different cars and often has failures. The Garage had an R36 in just last week with the same model and the same issue.
I now have a new compressor (Denso I think, I can get the model number if required) fitted and the whole system re-gassed (because it has to be emptied of gas before removing the compressor). This is what takes the time - removing the undertray and compressor is about 15 mins. Ditto replacing it. But I now have lovely and instant cold air which is 'freezing' as opposed to chilled which I was occasionally getting before. Not cheap but should last longer than the 10 years the current unit has lasted....
2010 R36 (MY10.5), Biscay Blue, RNS510, MDI, Electric tailgate, sunroof, Superchips remap - SOLD
2016 Octavia VRS wagon, moon white, Tech Pack, 18" black pack, electric boot, panoramic sunroof, Bluefin
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