I just bought a 2000 1.9 GT TDI PD 115bhp, and one of the selling points when i bought it was that it was the tax was only £110 per year because it was diesel. that somehow made sense to me at the time although i didn't investigate it or anything. I just went to buy my tax disc and was charged £175! I searched the dvla site but can't find any evidence of a special diesel class, there's only engine size. Is this a recent change or have i dreamed the whole thing up? anyone shed any light?