The impression I am left with, after witnessing the UK government's more recent racist, anti-Russian campaign, is that they are trying to find ways to appropriate Russian funds, businesses and property. First they forced Russian investors out of Cyprus with the haircuts and by giving Cyprus Banks such (undeserved) bad ratings that the Russian money flooded into London.
Of course, now it's step 2. Grab Russian assets!
It became obvious, again, just the other day when they refused to give Roman Abramovich a visa for the UK. They are trying to distance him from his assets. Of course, he very quickly outwitted the UK foreign office (aka, shit-for-brains-Boris-the turk) and got himself Israeli citizenship and now he doesn't need a visa. But still, they continue to try and find excuses to take his stuff and keep him away.
Overall, the UK are trying to find ways to stop people removing their money from the UK as the Brexit maelstrom unfolds. Another way they are achieving this is by letting the property market slump so much that people cannot sell and move out.
Nationalization of foreign-owned companies may be next?