ichkeria is just about correct, $10 oil equates to 4 p crude cost, 6p for refining and distribution, 2p for the station plus 2.4p for VAT......74p Excise and Vat and we have 88p/l.
However, things could swing quite dramatically for two reasons - (i) if Iran and Saudi get into a more serious spat that threatens the flow of oil out of the Gulf as 90% of both countries comes out through the Straits of Hormuz and (ii) the lesser OPEC countries are calling for cutting as they are really hurting......in fact Saudi is as well and they are burning up their forex reserves at an alarming rate - down to 3 years equivalent now.
Part of the fall out of this could be the Shell BG Expro tie up - though the Finance Director of Shell was saying that this should still go ahead, $20 buck oil is not going to be around for the life of the project, even if cheap oil at less than 20 would impact of NPVs and RT rates of return.