Thanks for all your advice Simon, much appreciated ( The same goes to Tcut also ).
At least we've done as much as possible to eliminate everything we could before coming to the dreaded head gasket failure conclusion.
Incidentally once I added Wynn the engine sounded much better but removing it and refilling with semi synthetic 10/40 has made it almost go back to the same sound.
It's difficult to describe other than metal to metal knocking from the front bank. Normally I would have dismissed it as maybe piston slap but with the garage saying it sounds like a warped engine they don't want to touch it, so I can't even get it repaired locally.
Paul
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