Car had been at main dealers most of the week, they were too busy to look at it. Getting a bit pissed off being fobbed off with excuses why they couldn't look at it. So borrowed the wife's car and had look myself. As i suspected it was Fuse 15 that had blown, replaced fuse and car started straight away.
Next problem is out find out why
F15 also supplies headlamp levelling, rad fan delay relay, A/C clutch relay, rain sensor and suspension levelling compressor relay.
My money is on the compressor relay circuit, mainly due to a few reasons, one the car cut out about 30 secs plus after starting the car, which is about the time the compressor usually starts up for a few seconds. Also the level sensor is underneath the car in all weathers.
I had a look at the level sensor today and the cable feeding it was caught between the sensor and the rear suspension arm. the cable didn't look damaged but I've moved it out of the way.
For some reason the suspension had been changed on the car before I bought it to Bilstein shocks and springs. So the suspension levelling had not been connected at the back, So I'm not sure what the levelling system was actually doing ? I've now pulled the relay that activates the compressor.