Wonkiness has returned. Got specialist to take a look and found an intermittent fault stored as 1400 which related to thermal cut out. Compressor working away, can't get a level so cuts out - makes sense.

Also found battery was slightly under voltage (new 3 months ago mind). Bench charged battery, retried and tested suspension all ok. Take it home and end up with clown car effect with passenger side much lower than drivers - it looks like drivers side is stuck at Level 3 or 4 whilst passenger side is doing as it should.

Just crawled under car to look at wiring loom into compressor and all looks ok, squirted WD40 in there. Checked connection to pressure sensor (assume this is the big metal cannister in the LHS of boot compartment??) all seems fine.

I'm stuck - compressor works, airbags work, control on dashboard works, o sagging on corners, no warning light on dash - just drivers side not responding, meaning lateral wonkiness. Aaagh!

Any ideas? Can things be reset? Valves blocked?

PS tried lowering car with engine off, ignition on - seemed to even things a bit....?