Fuel cost history month by month can be seen
here.The
current iata jet fuel index shows the comparison with 1 month ago and 1 year ago.
If you consider that the fuel cost has doubled in the last year and that a year ago fuel was almost 30% of Virgins operating cost it is very likely that fuel surcharges will increase in the short and long term.
In the medium term there is some speculation that oil price is driven upwards more by speculation than by shortage of supply. If that is so, then there are only so many tankers that can hold the speculation. That could mean a drop in oil price.
Many airlines will have hedged their fuel purchase - Virgin included - effectively they are now paying just a little more than last years price, perhaps 10-20% more rather than 100%. But that cannot last for much longer.
Airlines without a hedged position are in deep s**t - they are the ones that are very vulnerable. Others may see some predatory opportunities.