However, allowing plug-in hybrids would be folly, given research released just this week from Transport & Environment showing plug-in hybrids emit five times as many emissions on average in the real-world as they do in testing regimes.
That's crazy if true, but I know a research done here in Denmark also had results of PHEV running way way more on petrol than they were supposed to. So IMO PHEV should not enjoy the same tax benefits here a BEV does.