Later life of Darwin's 'Beagle' [audio 15min]

As part of a series, BBC News follows Dr. Robert Prescott as he searches for the final resting place of the ship aboard which Charles Darwin began to formulate the ideas which would eventually become his theory of evolution. The search leads to the bleak and flat landscape of the Essex mudflats. As the mud begins to yield its secrets, Robert considers Beagle's later life as an anti-smuggling watch vessel and examines some of the poignant relics from the 25 years she was home to coastguard families.