None of that really has anything to to with the price of butter. The dogs on the street could tell you that PHEV's were favoured as company cars due to their tax treatment and that real world MPG doesn't match stated figures.

For thousands of people living in cities, whose commute is less than 15km per day (my wifes commute is 1.5km each way) - they can run on EV power only for the day to day driving, which means less emissions in cities. Pushing these buyers back to diesels or pure petrol engines runs contrary to the governments aims, and is frankly braindead.