Hi all, hope this helps others. New M3LR on 22 plate. After 2k miles nasty creaking from back of drivers seat. Was being caused by steel support from lumbar system where passed through upper steel part of seat back. Coat silicone grease, no return at 10k miles. About 9k miles creaking from rear seats. Caused by central pivot point between the 40/60 split seat area, below centre arm rest. Removed all rear seats, silicone greased central pivot reinstalled. All seems good now.