If you flew BA or Virgin longhaul between 11 Aug 2004 and 23 March 2006 there is the possibility of getting a refund on the fuel surcharge you paid on the ticket because BA/Virgin were caught price fixing...
It will only be a refund of between £1-£11.50 per flight (BA) or £2- £10/per flight if Virgin - not a lot, but still money you are owed...
The way to go about claiming this compensation hasn't yet been decided, but if you don't claim it this will just be kept by BA/Virgin...