I often wonder what significant anniversaries are due at some point in the future as some of them might be of interest as triggers for blog posts or visits somewhere. However, it is often difficult to find out quickly what events have significant anniversaries - hence this section on the website.
By "significant anniversaries", I mean dates that are not, for example, the 73rd anniversary of something, but the 50th, 100th, 200th etc.
It should help to flag up interesting events.
Significant anniversaries during April 2018
| Anniversary | Details |
| 1st | Britain goes a full day without using coal power to generate electricity for the first time since the Industrial Revolution, according to the National Grid. (21st Apr 2017) |
| 1st | Prime Minister Theresa May calls a snap general election for 8 June. (18th Apr 2017) |
| 5th | Businessman James McCormick is convicted on three counts of fraud at the Old Bailey after selling fake bomb detectors based on a device for finding golf balls to countries including Iraq and Georgia. (23rd Apr 2013) |
| 5th | A London house goes on sale for a record £250 million, 700 times greater than the average £370,000 cost of a property in the city. (22nd Apr 2013) |
| 5th | The Royal Agricultural College at Cirencester is granted full university status as the Royal Agricultural University. (19th Apr 2013) |
| 5th | The funeral of Margaret Thatcher takes place at London's St Paul's Cathedral. (17th Apr 2013) |
| 5th | Street parties are held in a number of cities across the UK to "celebrate" the death of Margaret Thatcher (8th Apr 2013) |
| 5th | Police Scotland begins operations, merging all the former forces in the country. (1st Apr 2013) |
| 10th | The inquest into the death of Diana, Princess of Wales recorded a verdict of accidental death, caused by the heavy drinking, drug abuse and speeding of her chauffeur Henri Paul, who died in the crash along with Diana and Dodi Fayed. (7th Apr 2008) |
| 10th | The Corporate Manslaughter and Corporate Homicide Act 2007 came into force. (6th Apr 2008) |
| 10th | An embryo that was a cross between a human and a cow survived a third straight day after being fertilised at Newcastle University. A director for embryonic stem cell laboratories at the Australian Stem Cell Centre said that the "99 per cent human" embryo could improve research within the field of human diseases. The Catholic Church of England and Wales however said that the creation was "monstrous" and says that the later destruction of it is unethical. (2nd Apr 2008) |
| 40th | State Earnings-Related Pension Scheme introduced. (6th Apr 1978) |
| 40th | permanent radio broadcasts of proceedings in the House of Commons begin. (3rd Apr 1978) |
| 40th | first official naturist beach opens at Fairlight Glen in Covehurst Bay near Hastings. (1st Apr 1978) |
| 50th | the Abortion Act 1967 comes into effect, legalising abortion on a number of grounds, with free provision through the National Health Service. (27th Apr 1968) |
| 50th | five and ten pence coins are introduced in the run-up to Decimalisation, which will be complete within the next three years. (23rd Apr 1968) |
| 50th | Enoch Powell makes his controversial Rivers of Blood Speech on immigration. (20th Apr 1968) |
| 50th | London Bridge sold to American entrepreneur Robert P. McCulloch, for £1,029,000, who rebuilds it at Lake Havasu City, Arizona. (18th Apr 1968) |
| 50th | Thames Valley Police is formed by the amalgamation of Berkshire Constabulary, Buckinghamshire Constabulary, Oxford City Police, Oxfordshire Constabulary and Reading Borough Police. (1st Apr 1968) |
| 60th | The Life Peerages Act receives Royal Assent; the Act allows the creation of life peers who can sit in the House of Lords. As life peerages could be bestowed on women, this Act allows for women to sit in the House of Lords for the first time. (30th Apr 1958) |
| 60th | BOAC's first de Havilland Comet 4 makes its maiden flight. (27th Apr 1958) |
| 60th | the Hancock's Half Hour episode "Sunday Afternoon at Home" is first broadcast on BBC radio. (22nd Apr 1958) |
| 60th | the Church of England gives its moral backing to family planning. (7th Apr 1958) |
| 60th | The CND Peace Symbol displayed in public for the first time in London. (4th Apr 1958) |
| 60th | BBC Radiophonic Workshop created. (1st Apr 1958) |
| 70th | the Land Rover is unveiled at the Amsterdam Motor Show. (30th Apr 1948) |
| 70th | Rowntree's introduce Polo mint sweets. (15th Apr 1948) |
| 70th | Nationalisation of the electricity supply industry under terms of the Electricity Act 1947 comes into effect. (1st Apr 1948) |
| 75th | The submarine HMS Seraph surfaces in the Mediterranean Sea off the coast of Spain to deposit a dead man planted with false invasion plans and dressed as a British military intelligence officer. (30th Apr 1943) |
| 75th | worst bombing of Aberdeen. (21st Apr 1943) |
| 80th | Anglo-Irish Trade Agreement with the Republic of Ireland settles trade disputes and agrees to the Royal Navy abandoning the British sovereign bases at the Treaty ports in Ireland. (25th Apr 1938) |
| 90th | The 125th and final fascicle of the Oxford English Dictionary is published. (19th Apr 1928) |
| 90th | Cinematograph Films Act 1927 comes into force, setting a minimum quota for British films to be shown in UK cinemas. (1st Apr 1928) |
| 100th | First tank-to-tank combat, at Villers-Bretonneux, France, when three British Mark IVs met three German A7Vs. (24th Apr 1918) |
| 100th | Conscription Crisis of 1918 in Ireland: a general strike is held here against conscription. (23rd Apr 1918) |
| 100th | The Royal Air Force is created by the merger of the Royal Flying Corps and the Royal Naval Air Service. (1st Apr 1918) |
| 150th | HMS Repulse, the last wooden battleship constructed for the Royal Navy, is launched as an ironclad (with auxiliary steam propulsion) at Woolwich Dockyard. (25th Apr 1868) |
| 175th | William Wordsworth accepts the office of Poet Laureate of the United Kingdom following the death of Robert Southey on 21 March. (4th Apr 1843) |
| 200th | The case of Ashford v Thornton ends, with Abraham Thornton allowed to go free rather than face a retrial for murder, after his demand for trial by battle is upheld. (20th Apr 1818) |
| 700th | Berwick-upon-Tweed is captured by the Scottish from England. (1st Apr 1318) |
Alternatively, see all anniversaries for this month.
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