How can oil costs suddenly jump due to Libya when it normally takes Libyan oil tankers months to get to the US?

In the UK fuel is expected to go up to 25 pence a gallon due to the situation in the Middle East and another 25 pence if our Government continues with it's plan to increase duty (tax). That would mean a gallon of petrol (gas) will cost �7 or just over $11 by Easter. Good answer from Syd XVIII