US and UK negotiators are working toward an agreement that would allow
MI5 to serve US companies with wiretap orders for communications of
British citizens in counterterrorism investigations. The arrangement
would also allow Britain to serve orders for stored data. The draft
proposal would allow MI5 to access data stored on overseas computers
that are run by American organizations. The proposal would allow US
intelligence the same access in the UK.
http://www.theregister.co.uk/2016/02/05/uk_wants_warrantless_wiretaps/