Olly Dobson is one of Back to the Future's biggest fans, so it's been a dream come true to step into the shoes (and onto the skateboard) of the time-travelling teenager Marty McFly in the new stage adaptation, which is set to open at the Adelphi Theatre in the West End in August.But to make this iconic character really sing, both literally and figuratively, onstage, Dobson has to take things up a notch."The ante has to be up," Dobson says of translating the beloved movie into a musical....