And Donna Brandelli, another expert, told the jury that fingerprints rarely adhered to the shiny metal surface of a gun.

BBC: NEWS | Entertainment | How Spector evidence stacked up

The Clyde is described by the MoD as a "highly capable and versatile vessel" with state-of-the-art air and surface surveillance radars, a 30mm gun mounting and the capability to operate a variety of helicopters from her flight deck.

BBC: NEWS | UK | England | Hampshire | Warship HMS Clyde is commissioned

There are also launchers for surface-to-air missiles, various gun placements, submarine attack torpedoes and two combat helicopters.

BBC: News | In Depth | Military Fact Files