Just parked up my 2006 RRS in garage and noticed a slight lean , on measuring the distance from the centre of the wheel to the wing lip ive found that its 25mm lower on the n/s than the o/s both front and rear. Is there any way of adjusting this so the vehicle sits level????? There are no warning messages on display. Thanks.

Sounds like a compressor problem, but no doubt someone more knowledgeable will be along shortly.  ON THE WAY: BMW F21 M140i
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It raises and lowers fine but in access height ,standard, and off road height its 25mm lower on n/s in all 3 heights.

Could be a leak then, do a quick search on here for compressor problems, it may throw up the answer, could also be a height sensor I guess. ON THE WAY: BMW F21 M140i
MERCEDES GL350 - Metallic Navy Blue w/Grey interior

GOING: BMW F31 335D MSport+ xDrive Touring
GONE: Land Rover Discovery 4 HSE - Stornaway Grey w/Black Interior (wish we'd kept it )
GONE: BMW F10 520D MSport - Carbon Black
GONE:MY12 RRS SDV6 HSE Sumatra/Ivory/Grand Black Privacy glass

It sits like that even with the engine and compressor running

Are there any height sensors that can be manually adjusted ???????

The system can be calibrated with a suitable diagnostic tool - the sensors themselves aren't adjustable as far as I'm aware.

It could be problem in the main valve block next to the compressor. Hope not - they're not cheap. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

You need to check out your height sensors on that side one might be sized, make sure the rubber angle rods are free to move on the upper suspension arm, it might also be one of them failing, What are the upper arm bushes like are they worn...

Flack

Upper arm bushes are fine.Is there one sensor per wheel because mine is 25mm lower on both front and rear on the n/s not just the front . Do you think this is pointing more to wanting a level calibration.