The Fighting Temeraire by JMW Turner

Andrew Marr visits the National Gallery to uncover the story behind JMW Turner's The Fighting Temeraire. The painting, depicting a ship that played a vital role in the Battle of Trafalgar, proved a pivotal moment in the artist's career and remains a national treasure to this day, adorning the £20 note and topping a recent poll to choose the nation's favourite British painting.