An update on this. The noise started to get much louder on a cold start & then it developed a loud rattling at approx 3500 revs. I dropped it into the dealer last Friday and it was diagnosed as a fault with the actuator on the turbo - requiring a replacement turbo. I've got the car back this morning & all is well. The turbo was on back order for nearly a week, so it sounds like they have been replacing a few.
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