Who Killed Rasputin?

It's one of the most notorious murders of all time - the killing of Grigory Rasputin in Russia in 1916. The accepted version of events was supplied by self-confessed murderer Prince Felix Yusupov. Acting with a group of fellow conspirators, he is famously said to have poisoned, then shot and finally drowned Rasputin. But astonishing new evidence has now come to light linking the British Secret Service with the murder