Litvinenko, God bless his soul, died in November 2006 under allegations from the British authorities that the Russians poisoned him. If you ask me, I advocate capital punishment for treason, if it were.
Enough with the introductory remarks. I read this article [Russian] which confirms what the International Herald Tribune also published. Vyacheslav Zharko (photo above), a Russian citizen and a former employee of the FSB, resorted to his former employer seeking protection as he feared for his life, he claimed.
Allegedly and according to the state-owned NTV channel, Zharko worked both with the tycoon Berezovsky and MI-6. What a coincidence! He revealed being recruited by the MI-6 since 2002 to gather important economic as well as intelligence information for the Brits.
The Russian addendum is that Vyacheslav Zharko revealed the missing link. According to him, Berezovsky (who has a Phd in embezzlement, and not math) was actually supported by the Brits to finance the Orange Revolution in Ukraine based on the information Litvinenko provided him with.
The Pound Sterling is still a strong currency, I reckon.