Quick update, apparently it started making a noise week or so ago (presumably the chain stretching)
Then the noise go a bit worse so the bloke stopped driving it.
Then he went to start it and it didn't fire, said it felt lke the engine was just spinning.
Hopefully I'll get away with a new set of valves and a new cam chain etc.!
Where's the best/cheapest place to get the chains and tensioners? Trade club at Vauxhall?
😉