Hi Shogun - nice to hear from you again.
I didn't break into or crack any lines, so I have no reason to suspect any air in the system.
Also, its never sunk overnight.
I believe its all working correctly as it should.

The problem is that I seem to have reached a maximum (130bar you say) and the ride height is only just making it to correct height with nothing left in reserve for heavy loads.
eg: adjusting the valve manually allows it to sink and also to rise quite well. However, we started at 560mm and can only go to 570mm maximum height even if the valve is held over to go up and the engine held at 2000rpm for several minutes.

I'm also asking for ride height specifications because mine seems to be higher than the Bently manual (it says 526mm at the back, which would have my car very low at the back and higher at the front). At 560mm high ride height at the back, the sills are very parallel with the road - now at 570mm its only slightly perceptively higher at the back. But the LAD running at full pressure all the time with the valve always "on" to retain this ride height cannot be correct .

Plus my rear wheel camber is quite pronounced, which indicates the rear needs to be higher as well. There are no camber adjusters fitted on my model. The rear bushes are fine. The dog bones look a little ratty where the excess rubber goes over the metal, but the actual inserts are fine. I'm not sure if the dog bones effect camber anyway - do they?