don,t despair Ash, at least it didn,t fail whilst you were giving it some stick on the road.... i mean track
its prob just a faulty seal in the top of the strut, had a similar prob once on a VERY expensive rear shock on my race bike, a quick call to Dampertech will sort it out i,m sure, they,ll prob just send you a replacement asap, as its not a diy fix.
the prob on my race bike was a 50pence rubber seal but was soon repaired.
hope you get it sorted .
andy