It would help if you could get the car scanned for fault codes with VCDS, either at an independent garage for a small fee, or from someone local who could do it for free. There are a couple of UK-centric VW forums on the net, search for them and they will have user locations for those with the software. For 'beer tokens' they can be extremely helpful in pin-pointing exactly what is wrong with your car.
It could be a turbo under/overboost but I would suspect at some point it should drop into limp mode.
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