Britain's most advanced attack submarine, Ambush, has officially joined the Royal Navy fleet following a ceremony.
Head of the Navy Admiral Sir Mark Stanhope attended the service at Faslane naval base on the Clyde where the 7,400-tonne sub was granted the title HMS Ambush.
Ambush, the second of the Navy's Astute-class attack submarines, was launched in January 2011 at the BAE Systems shipyard in Barrow-in-Furness, Cumbria.
The widow of a Royal Navy submariner who was murdered by a fellow shipmate has collected a George Medal awarded to him posthumously.
Gillian Molyneux collected the medal on behalf of her husband Lieutenant Commander Ian Molyneux, who was shot dead on April 8, 2011.