
In 1919 the Australian government offered a prize of £A10,000 for the first Australians in a British aircraft to fly from Great Britain to Australia. Of the six entries that started the race, the winners were pilot Ross Smith, his brother Keith Smith as co-pilot, and mechanics James Bennett and Wally Shiers, in a modified Vickers Vimy bomber.

The Hornsey by-election of 1921 was held on 10 November 1921. The by-election was held due to the death of the incumbent Unionist MP, Kennedy Jones. It was won by the Unionist candidate William Ward.

The 1948 Northwood mid-air collision took place on 4 July at 15:03 when a Douglas DC-6 of Scandinavian Airlines System (SAS) and an Avro York C.1 of the Royal Air Force (RAF) collided in mid-air over Northwood in London, UK. All thirty-nine people aboard both aircraft were killed. It was SAS's first fatal aviation accident and was at the time the deadliest civilian aviation accident in the UK. It is still the deadliest mid-air collision in British history.

The 1948 Summer Olympics were an international multi-sport event held from 29 July to 14 August 1948 in London, United Kingdom. Following a twelve-year hiatus caused by the outbreak of World War II, these were the first Summer Olympics held since the 1936 Games in Berlin. The 1940 Olympic Games had been scheduled for Tokyo and then for Helsinki, while the 1944 Olympic Games had been provisionally planned for London. This was the second time London had hosted the Olympic Games, having previously hosted them in 1908, forty years earlier. The Olympics would again return to London 64 years later in 2012, making London the first city to have hosted the games three times, and the only such city until Paris and Los Angeles host their third games in 2024 and 2028, respectively. The 1948 Olympic Games were also the first of two summer Games held under the IOC presidency of Sigfrid Edström.

The 1956 London Heathrow Avro Vulcan crash was a military aviation accident that occurred at Heathrow Airport on 1 October 1956 when Avro Vulcan B.1 XA897 crashed while attempting to land in poor weather. The captain and co-pilot ejected safely but the remaining four crew were killed.

Brentford and Chiswick was a local government district of Middlesex, England from 1927 to 1965.

The British Empire Exhibition was a colonial exhibition held at Wembley Park, Wembley, England, from 23 April 1924 to 31 October 1925.

The Edmonton air crash occurred on 4 September 1938. A Hawker Audax of No. 1 Elementary and Reserve Flying Training School, Royal Air Force, based at Hatfield, crashed into a residential area in the Edmonton region of London. The aircraft was being flown by a 19-year-old pilot, Sgt Stanley Robert Morris RAFVR. The pilot and 12 people on the ground were killed, including four children.

The Harrow and Wealdstone rail crash was a three-train collision at Harrow and Wealdstone station in Wealdstone, Middlesex during the morning rush hour of 8 October 1952. 112 were killed and 340 injured, 88 of these being detained in hospital, and it remains the worst peacetime rail crash in the United Kingdom.

The 1950 Heathrow BEA Vickers Viking crash occurred on 31 October 1950 when a Vickers Viking operated by British European Airways (BEA) crashed at London Airport in heavy fog. The aircraft was on a scheduled flight between Paris and London's Northolt airport and 28 of the 30 passengers and crew on board were killed.

The 1948 Heathrow Disaster was the crash of a Douglas DC-3C of the Belgian airline Sabena at Heathrow Airport, London, United Kingdom on 2 March 1948. It was the first major accident at Heathrow Airport; of the 22 people on board 20 were killed, of whom most had British nationality.

The London Vickers Viking accident occurred on 2 September 1958 when an Independent Air Travel Vickers VC.1 Viking with three crew members aboard and loaded with two Bristol Proteus turboprop engines as cargo attempted a flight from London Heathrow Airport to Tel Aviv via Nice, Brindisi and Athens.

The 1942 Ruislip Wellington accident occurred on 18 October 1942 when a Vickers Wellington 1C medium bomber of No. 311 Squadron RAF crashed near South Ruislip station, Middlesex, on approach to RAF Northolt. The crash killed all 15 people aboard the aircraft, and six civilians on the ground including four children.

The Tottenham Outrage of 23 January 1909 was an armed robbery in Tottenham, North London, that resulted in a two-hour chase between the police and armed criminals over a distance of six miles (10 km), with an estimated 400 rounds of ammunition fired by the thieves. The robbery, of workers' wages from the Schnurmann rubber factory, was carried out by Paul Helfeld and Jacob Lepidus, Jewish Latvian immigrants. Of the twenty-three casualties, two were fatal and several others serious, among them seven policemen. The two thieves committed suicide at the end of the pursuit.

The Twickenham by-election, 1929 was a parliamentary by-election held on 8 August 1929 for the British House of Commons constituency of Twickenham in Middlesex.

The Willesden East by-election, 1923 was a parliamentary by-election for the British House of Commons constituency of Willesden East held on 3 March 1923. The constituency was a large one extending from Kilburn in the south to the Welsh Harp and on to Neasden.