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At its peak in the 1950s, Grimsby had the largest and busiest fishing port in the world. Today the trawlers have all but vanished but for one former fisherman, Michael Sparks, the memories of life at sea linger on.

Michael said: "They had a survey done of it at the time and they said deep sea trawling was 40 times more likely to lose your life than any other job on earth. Just looking at myself, 10 of us left school, there's only me left. 8 lost at sea".

Great Grimsby is part of our tour of the '5 live Top Twenty', the 20 marginal seats across the UK where the 2015 general election could be won or lost.

This clip is originally from 5 live Breakfast on Tuesday 7 April 2015.