Britain seems perennially confused about chickenpox.
Like, on the one hand, the NHS won't vaccinate and most people won't do it privately, and if you ask why, you are given this spiel about how it's better for people to get it when they are kids and we need the virus to circulate to prevent shingles in the elderly.
And yet if a kid has chickenpox, PANIC! Confine yourself to the house! Don't go ANYWHERE, you might spread it. A pregnant woman might catch it, don't you know?
And it just makes no sense. If the UK is Officially Not Vaccinating because as a country we WANT the virus to get everywhere, then why all the instructions to quarantine the kids and confine them to the house? If the shingles thing and the "it's better for them to get it when they are little" thing are true, then why isn't the NHS telling everyone with chickenpox to get out there and spread it as far and fast as possible and hold chickenpox parties for good measure?
Make up your minds, please, Britons!
I think the "shingles/keep chickenpox a chickenpox a childhood disease" excuse is largely a lie, and that the real reason why the British won't vaccinate is because it costs money and they won't pay for it.