So I spoke to BMW this morning, apparently it's recommended to regas the AC every two years, is that right? Obviously I'm loathe to pay £145 if this is not going to fix the problem (the AC works, the engine fan just sounds a bit strained when in use).
And they won't get the car back to me this week, as the rear isofix points were being re-welded (a BMW recall campaign rather than any fault with my X3), a spark fused two of the rear speaker wires together so they've ordered replacement cables from Germany but they won't arrive until next week
In the meantime I've got a 218d tourer to run around in... deceptively spacious inside and has foldable 3rd row seating! Was surprised that the boot space is actually wider than the X3's. The drive though is a bit rubbish, front wheel drive understeers and very poor grip on the front end in the wet (and this is noticeable at Jersey speeds

). On the plus side my boy is loving the big panoramic sunroof and "new car"