Picked the camper up from Broadland Leisure along with a hefty bill. It went in for a habitation check and a look over but there were major problems. The wiring for the LPG switch had worn and was shorting causing the engine to run on both petrol and gas at the same time. This could have caused the head gasket problems. The following pictures are not for the faint hearted!

The wiring for the gas switch was totally replaced along with fuel lines, clutch slave cylinder, a few other bits and....

.... the engine, no way to save the original. Many thanks to Jason for the quick turn around and the good explanations of it all.

It would be good if the next entry is about getting out there and enjoying it!