Why on Earth would they hide the truth? What would be the possible benefit from that? You think that England cares a rat's ass about Berezovskiy or Zakayev? If they murdered Litvinenko, and they have proof, they are going straight to jail.
This is typical paranoia, which I've been suspecting from you Russians all along
You think their is a global conspiracy against Russia
There is really no point for you to even follow this case, you've already made up your mind and whatever Scotland Yard says will not change your mind...