£15 is £15... It's nothing to turn your nose up at. Up here you could get a couple rounds for that, though I guess darn south you'd be lucky to get half a shandy.
And for those of us (un)lucky enough to be in the higher tax bracket, that £15 becomes £25...
It's not like it's harder to pay annually, if anything it's easier, why throw away money for nothing unless you have some desperate need or better use for that £300?
I believe that is correct, but if you've already bought it, does that mean there is no tax on the vehicle now? Or is it currently SORN?