Impressionist Danny Posthill's got a surprise for Simon | Grand Final | Britain's Got Talent 2015

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Impressionist Danny Posthill's got a surprise for Simon | Grand Final | Britain's Got Talent 2015 with tags britain's got talent, britains got talent, britain's, got, talent, britains, bgt, 2015, ant and dec, ant, dec, simon cowell, david walliams, alesha dixon, amanda holden, danny posthill, keith lemon, alan carr

His spot on impressions of Keith Lemon and Alan Carr, among others, had the Judges in stitches during his semi-final performance.

But will the public give him a big fat yes in the final?