A VPN is a service that people who are not privacy conscious (which is most people) tend to only use if they have a particular need for it, such as circumventing a region block for some service they want to use. This isn't a very common problem for the average person living in Britain right now, but it's about to be. So I think it's pretty fair to assert VPN usage is going to become more common, as it is a pre-existing, ready-made solution to the problem millions of British people are about to have.