A £200 difference in tax wouldnt change my mind, its less than 2 tanks of fuel, and bigger picture you will be spending a lot more on fuel andinsurance. Its all about finding the right car and when you see that gem go for it.
Best advice i can give is don't rush in and go for one because you love the noise after the test drive, keep a sensible head make sures its been looked after and is in good condition and if its all good go for it, you wont regret it.