The June settlement is now $72.22 per barrel, the highest for 3 years. The actual amount traded on Wednesday was 52% above the average. Current instability in the Middle-East is one factor.
However, growing demand from Asia is a constant factor which seems likely, on its own to push prices even further to around £100 per barrel. See:
And, contrary to some ‘experts’, there is still plenty left in the North Sea, with even more to come online west of Shetland: