Work on the first of the Royal Navy's two new Queen Elizabeth Class aircraft carriers is well under way at a dockyard in Rosyth.

The structure is almost complete in what is now the largest engineering project in the UK.

A government U-turn over fighter jets for the carriers cost taxpayers £74m, according to a new report by the National Audit Office.

The BBC's Defence Correspondent Jonathan Beale saw the progress being made on the ship.