No; some tiny minority of UK users may do that, but the overwhelming majority will just use whatever services are "approved" (follow whatever rules they have to, to stay in the market) and remain available by default.
I see no reason UK users couldn’t do the same. All it takes to get grandma on a VPN is for an enterprising grandson to set her up.
For what it's worth, in my experience when I was in China it was trivial to bypass the firewall using a VPN service.
But... if the need's there, people figure it out (as he's doing right now - for him it's something gaming related).
I wonder if I can put an IP block on my own site and just ignore it all too. Dumbass country.