I think you should do some more research.
The Polo 77 TSI is classified as a 'Lower Performance Turbocharged Vehicle' under their rules. You fill out a different form to that of the 'Prohibited Vehicles' form, and all you need to do is provide details of the vehicle, sign, and that's it. The only reason why you need to apply for an exemption is more to do with policing convenience rather than a blanket ban on forced induction. Should be a mere formality.
It's different from applying for an exemption for a 'Prohibited Vehicle' (e.g. Polo GTI), where you have to justify in a million ways why you need to drive such a car - it's really these sorts of vehicles the legislation is trying to cover.
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