Behind the scenes of Russell T Davies' twisty new thriller, Tip Toe

"When we were shooting Queer as Folk, if you'd have said to me, 'In 25 years' time, what will gay life and queer life be like?' I would've said, 'We'll have achieved equality, everything will be fine, and we'll all be hand-in-hand, skipping down the street'," he says with a wry smile.