Iranian Embassy Siege

One of the most dramatic incidents to occur during McNee's time with the Metropolitan Police was the siege of the Iranian Embassy in 1980. McNee and the Met were praised for their response and actions during the siege, however, when the first hostage was shot, McNee immediately handed control of the operation over to the British Army, who deployed the Special Air Service to storm the building and resolve the situation.

Brixton Riots

One of the most serious riots in London of the 20th century took place in Brixton over 10, 11 and 12 April 1981. The riot resulted in almost 300 police injuries and 45 members' of the public being injured; over a hundred vehicles were burned, including 56 police vehicles; almost 150 buildings were damaged, with thirty burned. There were 82 arrests. Reports suggested that up to 5,000 people were involved in the riot. McNee considered that it was unfair for the subsequent Scarman Inquiry into the riot to concentrate on policing and not extend in depth to the wider social, political and economic context. He believed the police were being set up as scapegoats for the riot.

Initially McNee alleged the rioting was not spontaneous but organised outside the Brixton area by extremist left-wing militants; however, no evidence of a prior conspiracy to trigger the riot was uncovered by Lord Scarman.^{[citation needed]} McNee was against the repeal of the sus law, believing that no evidence had been provided that arrests under that law did harm to the relationship between the police and black people. He did not believe pressure for repeal came from the law-abiding citizens of Brixton but instead from external extremists.^[4] He had earlier expressed his opinion that black people were disproportionately targeted by the sus law because there were indications that they were "over-represented in offences of robbery and other violent theft".^[5]

Buckingham Palace incident

On 9 July 1982, a man later identified as Michael Fagan broke into the private apartments at Buckingham Palace, where he spent ten minutes chatting to Queen Elizabeth II in her bedroom until he was apprehended by police and palace guards.^[6] The Home Secretary, William Whitelaw, sent his Permanent Secretary to ask McNee to take responsibility for the incident and resign; a request McNee declined.^[7]

Operation Countryman

The investigation into corruption amongst City of London Police officers and Metropolitan Police officers known as Operation Countryman occurred predominantly during McNee's tenure. McNee was very critical of the conduct of the investigation, in particular that the investigation team would not pass him evidence relating to complaints made against his police officers. Asst. Chief Constable Leonard Burt told his investigation team not to pass any evidence it obtained against Metropolitan Police officers to the Met Commissioner, Sir David McNee. Shortly before his retirement in February 1980, the Chief Constable of Dorset Constabulary, Arthur Hambleton, the superior of Burt, made allegations that Countryman had been willfully obstructed by Commissioner McNee and the Director of Public Prosecutions (DPP), Sir Tony Hetherington.