Big thanks to @gadgetman for dropping around to have a look see for me.
So at what point do I know if the head is rooted? Obviously the first step is to replace the radiator. Is there an easy way to work out it out or can the local mechanic check it easily? Or is it a case of waiting for something catastrophic to happen? I'd rather get it fixed before that happens but not if it isn't necessary.
Cheers
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