Banning VPNs seems effectively impossible. Any ip address can act as a vpn. There are also zero identity providers like mullvad.
I imagine this would curtail a large proportion of mobile VPN usage.
Blocking desktop VPNs would be a bit more adhoc but it is possible to make it much harder for many people to download VPN clients.
[1] https://www.digitalsilk.com/digital-trends/mobile-vs-desktop...
Is that comparable, for the UK? Maybe other EU members would agree?
As an American, I have trouble comprehending multiple governments colluding to enable mass government censorship, and expecting to stay in power. But, I know nothing of the European mindset.