Look on the bright side, you could have bought a 1974 TR6: if your neighbour had a 1973 TR6 he would be paying no road tax at all. Same car, same engine. Go figure.
No but I do have a motorcycle that produces less CO2 than Band A (free road tax) cars and carries exactly the same number of passengers to and from work (i.e. one!!) while inflicting very little damage on the road surface... But they still sting me for 50 quid a year.