Had warning on dash a couple of times saying normal height available only. Its been back to the dealer and they replaced the compressor but also noticed a pin hole in one of the pipes and they have ordered a new pipe to fit.
Since the dealer has fitted the new compressor it comes up with normal height all the time. been out this morning and it is way down on the passenger side.
Has the air suspension got a dual system one for left or right and then individual to each wheel? The dealer didn't say where this hole was but if its at the back left wheel area could this be the reason its down?

Now, when I first viewed the car I thought it was leaning to the left a little but put that down to the forecourt but noticed it again once I bought the car. Its worse this morning than in previous days. I'll try to raise the suspension or lower it and see what happens when I move the car soon.

Right, started car and raised suspension up and still got a lean. Dropped it down and its still got a lean on the left. Can really hear air escaping though. Its really loud. Maybe the values are out, I'll mention that to dealer tomorrow and see if they can reset them, if that's possible.