Hi Paul, yep, I think that explains things nicely. The wastegate was stuck in a closed position, so it seems that was the problem, causing the overboost ! Maybe a whistle describes the noise better !
Drove it home last night, it's only 5 miles, but it seemed fine, lots of power and it now revs without cutting out.
It even passed the MOT with no advisories for a change !
Thanks again for everyone's help and ideas.
Phil
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