Eight of the UK's biggest supermarket chains have agreed to fairer pricing policies, including not inflating prices to make a later discount look attractive. However, Asda is stalling.
Update, 28 Nov, 12pm: Sainsbury's has changed its mind and will now cut up to 3p per litre off petrol at all its forecourts tomorrow, although the cost of diesel will remain unchanged. Sainsbury's prices vary nationwide.