She had a personal understanding of and deep connection to her character, she admits. ‘She’s depressed, and I know what that’s like,’ she says, a reference to the depression that has haunted her since she was 17. It’s a chemical imbalance, she explains, that she’s managed since but which she always has to be aware of. It’s oddly reassuring, and it humanises her enormously, when she explains her self-doubt, being unhappy despite having a famous husband (fellow Spooks actor Matthew Macfadyen), three kids and a good job. To a degree, it’s the modern condition — depression and anxiety have been on the rise for the past few years, with young Londoners especially at risk.