Had a similar issue on my Rover 1.8 Turbo tourer. Turned out the wastegate valve was seized. Once unseized it was fine, but, as I don't really drive it that hard, it seized again some months later, so now at the suggestion of Jules I give it a really good blast every journey making sure that I go over 4000 RPM, this seems to beng working ! Might be worth checking if you have not done so ?
Phil
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