Every corporate I know of, uses VPNs. Especially when workers connect from home. Is the UK government really interested in going up against the majority of their business partners...?
It's not about a technical capability to encapsulate packets, it's about whether people use it to bypass censorship or not.
The government use VPNs. The ban will target individual use.
It would not be hard to write laws to restrict one use but not the other. They may be the same tech but the use-cases are quite different.
Laws don't apply to corporations. It'll only be used to punish individuals.