Former Skins actor Kaya Scodelario talks about growing up poor in London, why she loves doing action films – and the pitfalls of taking her kids to work. When one man discovered someone had been impersonating him for years without his knowledge, he decided to act. He reveals what happened next. And ‘the climate crisis and all the evil in the world drives me to despair’: Philippa Perry advises one reader on how to cope