An appeal for information has been sent to all MI5 staff over false evidence the service gave to three courts in a neo-Nazi spy case. MI5's regulator is investigating how it came to make false claims ...

The prime minister has ordered a new investigation into how MI5 gave false evidence to three courts about conversations with the BBC. Sir Keir Starmer's direction follows requests from the High Court ...

Slow Horses features several MI5 agents whose abilities and skills vary drastically. The central premise of Slow Horses is that a group of problematic MI5 operatives have been ousted from the ...

MI5 turned a blind eye to “grotesque” crimes committed by a British spy who infiltrated the IRA during the Troubles, a damning report has found. Agent Stakeknife worked within the internal security ...