Honestly I'm not opposed to age restriction, so long as its only ever accomplished using zero knowledge proofs of some kind. Or just without revealing identity. But they've made it pretty clear with the systems they have implemented already nearly everyone is either incompetent or the goal is survelence all along.
The bill is the "Children’s Wellbeing and Schools Bill" here and this is the amendment they're talking about: https://bills.parliament.uk/bills/3909/stages/20215/amendments/10027478
There's also a petition to stop that bit "Do not ban children from using virtual private networks". I'm pesamistic about its chance of it succeeding but after the shinanigins around digital ID, who knows?
Slightly unrelated but the other day I discovered tor browser was being blocked on NHS wifi I could only connect with a bridge. The internet in this country makes me depressed now.