Earlier quoted context omitted.
You can definitely buy pouches of tobacco to be used like snus in the UK (and I'm almost certain that was the case before Brexit, too). Unless "snus" has some specific definition that's illegal and the UK sells an alternative? Not sure, last time I tried snus was in Finland over a decade ago.
Actual snus(powdered tabbaco sold and advertised as a product you put up your nose) isn't legal for sale in the UK: https://www.buynicotinepouches.co.uk/blogs/news/buying-snus-...
I see it's still legal in .de, and according to wikipedia has no tobacco-taxes on it since 1993! The real stuff, not only that white grapesugar/menthol stuff.