Thanks for taking the time to reply: much appreciated.
It has gold oil in it and it looks in very good condition.
Yes it still tries to drive forwards in neutral but I have given it to my local plant mechanics, JLB specialist vehicles in Halifax to look at. They did a very good job last time with rhe head gasket on it so I am hoping they will fix it again this time. Fingers crossed.
I will make sure that I update this thread with any information I get from them, good or bad.
Thanks for giving me the engine code and make!