UK - MI5 used hidden electronic surveillance equipment to secretly monitor 10 Downing Street, the Cabinet and at least five Prime Ministers...
The extraordinary disclosure comes despite a succession of parliamentary statements that no such bugging ever took place.
...top-secret files held by the Security Service show it installed electronic listening devices in three highly sensitive areas of No10 – the Cabinet Room, the Waiting Room and the Prime Minister’s study.
It means that for nearly 15 years, all Cabinet meetings, the offices of senior officials and all visitors to the Prime Minister – including foreign leaders – were being bugged...
[Harold] Wilson hired private security firms to sweep his office for listening devices and was said to have pointed out electric light fittings to Downing Street visitors, indicating that they might be bugged. (more)