The UK also recently tried banning VPNs. It simply isn't possible. However, it'll make prosecuting dissidents and people with good opsec a lot easier because they can just say "well you might not have anything incriminating on your hard drives but you DO have a VPN client" and use that to get a tiny victory against someone who would otherwise go free.
Russia, China & UAE are quite successful with blocking VPN's. I wouldn't be so sure that in near future UK or any EU country censorship or heavy restrict VPN's.