 In the UK, Abu Hamza and Yaser al-Sirri, Sir Cliff Richard, Jim Davidson, and the late Edward Heath were each subjected to this tactic.In Sir Cliff Richard's case, the police 'tipped off' the BBC that a search was imminent.A BBC helicopter filmed as five police cars arrived at the singer's home and eight officers searched the premises, 'all of it broadcast in dramatic pictures instantly sent around the world'.