Hilico;
Well edited that man! You are right, There is not a great difference for us, the largest effects are with the big carriers. Just put the same sums to a fleet of 260 airliners from the A320 up to the B747-400 and the figures are suddenly huge. I know that you can get a draw back if you are taking the fuel overseas, but the smaller end of the fleet will still be doing the internal work and the bills will mount up.
According to the ex Mrs VH (who worked for the treasury at the time) one of the reasons for the low duty on jet a1 was to allow UK carriers to compete on a more level playing field. The legislation was framed during the reign of Mrs Thatcher when Lord King (who she called her favourite business man) was in Charge at BA.
BA is one of few European national carriers with no government subsidies. A price hike of this nature could bring it's profits right down and possibly wipe them out altogether.
VH