Yep - new air spring (means airbag), and everything back to normal.

Cost for the part was £120 (make sure you specifiy if it has sports suspension).

Cost for fitting was £130 (2 hours labour inc. VAT).

They really needed the 2 hours by the looks of it. When I turned up they still had the Autologic box connected up reading the spring pressures and adjusting the air till the height was correct on both sides. Looked quite complicated.

Anyway - 2 days and no more SELFLEVEL SUSP.INACT message !!! (And the car sits straight and doesnt hiss at me as I walk away

Kev