I saw this on Mastodon posted by @infobeautiful@vis.social and figured that it was appropriate for this community and absolutely not controversial in any way shape or form.
The UK quite often sees words switch around in how posh they are. This is because most people want to sound posher than they really are, while the actual posh people have nothing to prove and want to seem down-to-earth. See U and non-U English.