The price of petrol in the UK is considerably more than what people pay in the US. The average cost today for a gallon of regular unleaded in the US is $2.012 (click here for my source, but note that the number changes daily). People in the UK thus pay about 2.85 times for petrol what people in the US pay.
There was some hype about petrol prices falling below £1 per litre, and I'm sure there will be many happy customers at the pump. But excitement is relative. It's good to keep an eye on what happens outside one's country, of course, even the stuff that doesn't make huge headlines.