It always sounds a bit wanky and pretentious when an actor says a character they’ve played will live with them forever, but Emily Blunt wasn’t the first to say it, and she won’t be anywhere near the last. The plight doesn’t affect every thespian, and why would it? At the end of the day, they’re being paid for a performance, and when all is said and done, they need to abandon the role and move on to the next one, so it’s a bit self-aggrandising w…