Well Morrisons are leading the way with the cheap fuel "Morrisons said for a typical 50-litre fill up, customers will save £4.50 compared to the current national average price of petrol. In April, some filling stations around the country had been reportedly offering petrol at less than £1, but this is thought to be the first time a national chain has sold petrol throughout the UK below the threshold since February 2016." Full story from Auntie.
It should be discounted, after all it's been in the tanks for ages and is therefore NOS