A Challenger II.
Not mine, but one of these:
Check out this Kia Sedona that I have just found on #motorscouk
The short answer is no, duty is identical at 57.95 ppl on unleaded and diesel at the moment.
As a couple of people have said, diesel always becomes more scarce in the winter because it's a middle distillate like heating oil which, for obvious reasons, sees demand increase this time of year.
There's very limited refining taking place in the UK now, and the bulk of middle distillates are imported.Not hard to get your head round when you consider there were 30 active refineries in the UK in the 1970s and now just 3.
Diesel dropped by 8p / litre in the last few weeks.
Filled up the Mrs's car this afternoon in Morrison's, Preston. Diesel, £1.267 on the pump, 10p litre off voucher, paid £1.167. Result - happiness data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7.
Diesel is still quite a bit pricier where I am (about 10p per litre more on average) :/
Diesel still dropping in price. Down to 127.9p at my local Shell.
Rumour is a few more pence should be falling off the price.