It would seem Her Majesty's Government has decided that threats from deep space, at least the living kind of threat, are no long something they need to keep a watch over.
The Ministry of Defense closed the office and hot line set up for UFOs back in 2009 and they have been slowly releasing the documents generated by the office in the past 50 years. It wasn't for a lack of action, over 600 calls were registered in 2009, the second highest year on record. But according to officials it was for lack of any evidence gathered that showed signs of alien life, and this after the thousands of reports.
Most of the reports were eventually explained, or crazied away, but some few remain a mystery.