The next step I assume is banning VPN use for anyone under 18 in the UK, followed by only allowing academics or certain roles to use them.
Banning VPNs seems effectively impossible. Any ip address can act as a vpn. There are also zero identity providers like mullvad.
I am pretty sure we are slowly but surely heading towards a point where every country will implement its own great firewall and block every website except those in a whitelist approved by the government.