| 11th February 1975 | Margaret Thatcher defeats Edward Heath for the leadership of the Conservative Party. |
| 13th February 1975 | A fire breaks out in the World Trade Centre. |
| 28th February 1975 | A major tube crash at Moorgate station kills forty-three people. |
| 4th March 1975 | Charlie Chaplin is knighted by the Queen. |
| 4th April 1975 | Bill Gates founded Microsoft in Albuquerque, New Mexico. |
| 30th April 1975 | The Vietnam War ends as Communist forces take Saigon, resulting in mass evacuations of Americans and the South Vietnamese people. As the capital is taken, South Vietnam surrenders unconditionally. |
| 16th May 1975 | Junko Tabei becomes the first woman to reach the summit of Mount Everest. |
| 5th June 1975 | The United Kingdom votes ‘yes’ in a referendum to stay in the European Community. |
| 11th August 1975 | British Leyland Motor Corporation comes under British government control. |
| 15th August 1975 | ‘The Birmingham Six’ are wrongfully sentenced to life in prison for the Birmingham pub bombings. |
| 5th September 1975 | The London Hilton hotel is bombed by the Provisional Irish Republican Army. Two people are killed and sixty-three are injured. |
| 1st October 1975 | Muhammad Ali defeats Joe Frazier in the “Thrilla in Manila” boxing match in the Philippines. |
| 9th October 1975 | A bomb explosion outside Green Park tube station, near Piccadilly in London, kills one person and injures a further twenty. |
| 29th October 1975 | Peter Sutcliffe, also known as the ‘Yorkshire Ripper‘, commits his first murder by killing Wilma McCann. |
| 3rd November 1975 | The first petroleum pipeline opens from Cruden Bay to Grangemouth in Scotland. |
| 20th November 1975 | Spanish dictator Francisco Franco dies in Madrid. |
| 25th November 1975 | The Irish Republican Army is outlawed in the United Kingdom. |
| 29th November 1975 | Graham Hill, English Formula One racing driver (b. 1929) dies when he crashes his aeroplane in foggy conditions. |