AlexBritton commented Warning that petrol prices may soon increase

Petrol prices are still hovering around the £1 a litre mark – but may soon be on the up.The Big Four supermarkets – Asda, Tesco, Morrisons and Sainsbury's – all slashed their prices after the price of oil plummeted.But despite the promise of a return to 2009's rates, the price at the pumps has remained steady for almost a month, but it won't last.Brian Madderson, Chairman of the Petrol Retailers Association said: "From a low point of $45 per barrel for Brent Crude in