However, two air marshals found flight lieutenants Jonathan Tapper, 30, from Burnham Thorpe in Norfolk, and Richard Cook, 28, from Church Crookham, Hants, guilty of ''gross negligence''.

BBC: Lords reject Chinook appeal

The pilots - Flight Lieutenants Jonathan Tapper and Richard Cook - were said to be to blame but the conclusion has been strongly contested by their families and some politicians.

BBC: News | UK Politics | 'Pilot error' finding repeated