I just put £190 of road tax on the na at the we. It doesn't sound that expensive, but I definitely did < 3k miles last year in it, call it 1900 miles and that's a penny a mile I'm paying just in road tax.
I'm not selling the v6 until next year at least now (I just booked it into Goodwood in November for £169 + £30 tuition which is a good price for a Saturday there), so if you wait long enough ... :-) ...