Think I'd add..'at the moment' fuel isn't going to get cheaper. And there is a reasonable chance of diesel cars being hit somehow in next budget. Theres been hints of it happening, though I don't think it will be as severe as some of the Daily Mail headlines.
Tax at the pump is 70+% Tax on electric is 5%.
Diesel is a difficult one as they were promoted (including the Government) as an option in fact Labour cut duty on Diesel as an incentive, and the present system still has incentives to buy diesel
Is it fair to penalise those who acted in good faith and believed the same Governments that now wish to penalise them for following that advice