His work can fetch up to £5,000 and has been bought by the likes of Sir Elton John. But before he found fame and fortune, the graffiti artist Stik was homeless. That is why he's decided to donate tens of thousands of signed prints to help others just like him.
Nick Thatcher reports.
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The work, called Gift Horse, replaces the giant blue cockerel that previously sat on the plinth.
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