Life of M by Rachel Cusk review – is this story of a film star based on Natalie Portman?

A teasing tale of the friendship between a writer and an actor explores the fallout from fame, and the blurring between pretence and reality M is a celebrated film actor. A star since childhood, now the face of a major fashion brand, she has been famous all her life. That her career closely resembles Natalie Portman’s has been gleefully seized upon by the press, something Rachel Cusk must surely…