EDIT: After fully reading the article, I realized that the author of the article deals with this issue: U.K.'s libel laws make it dangerous for media watchdogs to call out oligarchs explicitly.
There's also this photo of a pit within one of the stores being filled with cement just before being shutting down: https://www.reddit.com/r/london/comments/tebfqa/almost_all_o...
I've been trying to find out more about what was going on other than money laundering but haven't been able to find much
From memory, the owner set up multiple other business used to secure COVID loans from UK Gov and also had the candy store business buy those business from him. The business was/is a front for these other activities.
If you are interested then I can maybe scan the article.
It may be known as such among a tiny minority who have multiple citizenships and most likely do not reside in Russia. Where investing in stock market/index funds is quite uncommon for an ordinary person, what a handful of the top .0001% do to their finances is even further out there. I know a few somewhat well-off by Russian standards people and no one has been to GB much less use it for some shady financial schemes.