Say what you will about Russell Brand - and many do - but his interviews are invariably more entertaining than a troupe of juggling monkeys. He's latest role sees him playing a drunken playboy, a part, he jokes, he's been preparing for his entire life. If it's a Method part for Brand, his co-star Mirren tells us that she took the opposite approach, picking a role that took her miles out of her comfort zone. We caught up with the pair, as well as co-star Greta Gerwig and director Jason Winer to talk about the film.