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Working-class artists are creatively breaking down barriers - one using Marmite on toast - to build careers in the notoriously exclusive world of fine art. Nicola Bryan reports.

From pop royalty Mariah Carey and Sir Tom Jones to actual royalty the Prince and Princess of Wales, Nathan Wyburn has created artworks of them all.

His break into the notoriously exclusive world of fine art has been unconventional - kicking off in a 2010 YouTube video where he created Simon Cowell's portrait using Marmite on toast before starring on ITV's Britain's Got Talent the following year.

Research suggests Nathan, the son of a stay-at-home mum and factory worker dad from Ebbw Vale in the south Wales valleys, is an anomaly in the world of art...Keep reading on BBC News.