It could be worse. I bought mine after the latest road tax changes came in and I couldn't resist piling on a few options, so I just renewed my road tax at £440 for the year!! I think it's ridiculous to penalise a plug-in car because its list price is similar to luxury cars, but at the end of the day I really like this car and wanted it with options on so I decided screw it I'll pay the tax.
The old diesel I replaced was £30 a year. It's like the government was trying to put me off replacing my old diesel with a new hybrid!