Petrol prices are heading to below £1 a litre for the first time since 2009 in a big pre-election boost for consumers. Plunging world oil prices coupled with a new supermarket price war is driving down pump prices, lowering inflation and leaving consumers with a cash windfall which is boosting economic growth. The average cost of a litre of petrol has dropped from 131.6p in July, when oil was $105 a barrel, to 112.6p a litre now, with oil at $57 a barrel.
