He's pulled off street performances involving hundreds of enthusiastic amateurs, as well as many who'd never danced before, in Barnsley, Skipton and Huddersfield. Now choreographer Steve Elias wants to bring all three towns together for one breathtaking dance finale.He's chosen York as the stunning backdrop for the performance. In episode four he visits the ancient city to recruit the huge numbers he needs to bring his vision of a mass dance event to life.But can he persuade York's reluctant residents and iconic institutions to come on board, in the wake of the terrible floods which hit the city a year ago? And can he get Barnsley back on side to achieve the scale he wants for the biggest performance of his career?