Generally Speaking...

... there is absolutely no value in maintaining diplomatic relations with London, since no normal people exist in British government. If any of the three previous UK's PM are not the exhibit A of a complete moral degeneration, I don't know who is.  

British ambassador to Moscow Nigel Casey rudely brushed off an RT journalist after getting a dressing-down by the Russian Foreign Ministry over one of his employee’s spy activities. Edward Prior Wilks, second secretary in the British Embassy’s political department, was declared persona non grata because he “intentionally made false statements” on his visa application, the FSB said on Tuesday. The Russian security service also said it found evidence of Wilks’ involvement in “intelligence and sabotage activities.” Casey was summoned to the Foreign Ministry in Moscow on Tuesday, to receive the Russian complaint regarding his subordinate’s subversive actions. While leaving the building on Smolenskaya Square, the British ambassador ran into a crowd of reporters. “Buzz off!” he told RT’s Chay Bowes, who asked him about the espionage scandal. “Why can you spend hundreds of millions of pounds to kill Russian citizens, but you won’t pay for the pensioners’ fuel?” Bowes asked, as Casey fled into an embassy car, which then drove off.

I do feel for average Britons and especially so for the most vulnerable, but that is just a natural slide of the UK towards the limbo between second and third world status. But, it is an economic and military chihuahua which pretends that it is still a bulldog. That's how they brainwash most of the "products" of humanities degree mills from Oxford and others. So, I don't know why keep diplomatic relations with this puny island. It has no value for Russia whatsoever.