It’s nearly a quarter of a century since Michael Nunn and William Trevitt bravely left their safe haven at the Royal Ballet to set up BalletBoyz, a company aimed at developing the underused potential of male dancers and exploiting Nunn and Trevitt’s passion for film technology. At the time this seemed like a useful mission – stereotypes and prejudices lingered around men in tights, and the formats for smaller dance companies needed loosening up.