OK, Update time...
As per Mark DTM's advice, I rang Jim Glayson this morning, his initial thoughts were that the belt had slipped, but was surprised that it would start. His first advice was to get it out of the garage it is in, so phoned them up to check they hadn't started and had a chat with the service manager, he said it would be a new engine job at a cost of .. wait for it...
£3,495
So I told them not to bother even looking at it and I will get some help and tow it home at the weekend.
Jim doesn't have a workshop, so I will have to get him round to my place to diagnose the fault.
The question is.. What I am looking for from Jim, is "cambelt gone" enough? or do I need to get a more thorough diagnosis in order to know what would required for a "head change party".
Sorry to be a bit of a numpty here, but I am abit (well alot) out of my depth here, and don't want to waste peoples time.
Also, where would I get second hand heads from etc??
Cheers
Merv