Mutt,
I think that SV may be an "extreme case" here, with the economics of the fuel supply "at home" and the situation,say, at LHR.
However, I suppose you could say that the UK government bring it on themselves, and us, by taxing fuel (road, air) so highly.
I wonder if BA used to and BMI now do, tanker out of RUH, JED? Certainly would make "commercial sense"!