Suspension issue

[Eady]

Hi everyone, today after work I came out to see my 2010 RRS sitting lop-sided : the left had side suspersion was sitting down (possibly below) the normal low setting. I started the car expecting an error/fault warning, but got nothing and the car leveled up?? The ride home felt a bit strange, however, the car was sitting level, though a bit down in the front on both sides. Any ideas as to the cause?
Any feedback much apprieciated.

Cheers, Dave
2010 RRS TDV8