The Russians have always sought to subvert Western democracy. Or in the case of the UK, alleged democracy.
The difference is that the tools they now use are nativists, right-wing nationalists and neo-Nazis. Whereas in the USSR days, it used to be the far-left Labour, Communist trade union officials, and other people on the left end of the spectrum. The objective remains the same, to change Western nations in their interests. E.g. detaching the UK from the EU, creating suspicion about our institutions, and instigating radical change in their interest. The internet and the weird conspiracy theories it generates assist them in this.