Researching mine and Stephen Graham’s Netflix drama, I realised the brains of under 16s are unable to cope with ideas as dangerous as those in the ‘manosphere’. The government needs to ban smartphones for children

Two and a half years ago, Stephen Graham phoned me up to ask if I was interested in writing a show about knife crime. He wanted to talk about young male violence towards women and he had two stipulations: he wanted to do it in a series of single shots, and he didn’t want to blame the parents.

I enthusiastically got involved and suggested we write together. At first, we didn’t know why Jamie, the perpetrator of the attack, did it. We knew he wasn’t a product of abuse or parental trauma. But we couldn’t figure out a motive. Then someone I work with, Mariella Johnson, said: “I think you should look into ‘incel’ culture.”