Five men are facing lengthy jail terms when they are sentenced for stealing a "king's ransom" in Britain's biggest cash robbery in Kent.

Lea Rusha, Roger Coutts, Jetmir Bucpapa and Stuart Royle stole £53 million from the Securitas depot in Tonbridge.

The gang kidnapped depot manager Colin Dixon, his wife Lynn and their young child and used them to gain entry to the depot. They also used information provided by inside man Emir Hysenaj to plan the raid on the Bank of England cash store.

Hysenaj, a Post Office worker of New Road, Crowborough, filmed inside the building using a hi-tech miniature video camera no bigger than a 50p coin that was fixed to his belt.

On the night of the hold-up, the heavily-armed robbers trussed up 14 employees with cable ties and threatened to kill them if they disobeyed orders. CCTV pictures seen by Old Bailey jurors showed them loading cages, black holdalls and bundles of £20 notes into the back of a 7.5-ton Renault lorry during the 66-minute early morning raid in February 2006. The robbers had to leave £153 million behind because they could not fit any more into the vehicle.

Police have since recovered £21 million from a series of locations around Kent and south-east London, with much of the rest of the money believed to have been spirited away to Morocco and northern Cyprus.

Rusha, 35, a kick boxer and former roofer of Lambersart Close, Southborough, Tunbridge Wells, Kent, was at the heart of the conspiracy. He was one of the robbers and also one of the two-man kidnap team that seized the Dixons. Rusha was found guilty of conspiracy to kidnap, conspiracy to rob and conspiracy to possess firearms by a jury of seven women and three men.

Car salesman Royle, 49, of Allen Street, Maidstone, Kent, unemployed Albanian Bucpapa, 26, of Hadlow Road, Tonbridge, garage owner Coutts, 30, of The Green, Welling, south-east London, and Albanian Hysenaj, 28, were also convicted of the charges. Two of the suspected robbers cannot be named for legal reasons while another, Keyinde Patterson, is believed to have fled to the West Indies.

Michelle Hogg, a hairdresser who disguised some of the robbers using theatrical prosthetic make-up, proved to be their undoing in court.

Hogg, 33, who began the trial in the dock alongside the other defendants, was cleared after agreeing to give evidence against them.