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The seas and lakes of the UK and Ireland can catch out even the most experienced seafarers and, more often than not, it is the RNLI volunteers who pick up the pieces.

In Essex, the crew at Walton and Frinton get an unusual mayday call to a ship called HMS Pickle. Arriving on scene, they discover it is not the modern naval vessel they were expecting but a replica of a ship that once served in Nelson鈥檚 fleet, and though the original survived the battle of Trafalgar, this one is shipping water and sinking fast.

On the east coast of Scotland, the crew at Anstruther face a tricky rescue trying to extract a walker with a badly broken leg from a remote coastal path. And in the Shannon basin in Ireland, the crew at one of the RNLI鈥檚 few inland stations at Lough Derg are woken in the early hours of the morning by their pagers - cries for help have been heard coming from the 40-mile-long lake. After launching into inky darkness and thick fog, the crew make an eerie discovery.