Britain’s largest ever warship has squeezed out of its dockyard, as the ship heads out on sea trials.

The 65,000 ton HMS Queen Elizabeth slipped out of Rosyth dockyard and into open water through an exit with only 14in clearance on either side and 20in of water under the keel.

The aircraft carrier then edged along the Forth under three bridges, including the landmark rail bridge, with a little over six feet to spare.