Liz Kendall also wants Ofcom to report to parliament every year on how effectively social media firms are keeping under-16s off their platforms

Starmer acknowledges some teenagers will get round these restrictons. But that does not make the rules pointless, he says.

Will it mean that no child ever looks at social media again? No.

But look, this might shock you, but it doesn’t shock parents of teenagers; they get around other laws too.

Some technology companies want us to think that social media is unchangeable, part of an almost natural order.

But we have to resist that kind of learned helplessness. We have agency, we can change it, and we will.