|Covid-19|Monarch — Victoria
Prime Minister — Robert Cecil, Marquess of Salisbury (Conservative)
3 January — Royal Yacht Victoria and Albert almost capsizes while being floated out of dry dock at Pembroke Dock on completion of her construction.
9 January — Influenza outbreak in London.
24 January — Second Boer War: Boers repel British troops under General Sir Redvers Buller at the Battle of Spion Kop.
31 January — The Gramophone Company copyrights the His Master's Voice illustration.
5 February — The UK and the United States sign a treaty for the building of a Central American shipping canal through Nicaragua.
6 February — The House of Commons vote of censure over the government's handling of the Second Boer War is defeated by a majority of 213.
8 February — Second Boer War: British troops are defeated by Boers at Ladysmith, South Africa.
12 February — Meeting held at Mile End to protest against the Boer War ends in uproar.
14 February — Second Boer War: In South Africa, 20,000 British troops invade the Orange Free State.
Boer War: In South Africa, British military leaders receive an unconditional notice of surrender from Boer General Piet Cronjé.
Creation of the Labour party; Ramsay MacDonald is appointed its first secretary.
28 February — Second Boer War: The 118-day Siege of Ladysmith is lifted.
March–September — War of the Golden Stool fought against the Ashanti Empire.
1 April — Irish Guards formed by Queen Victoria.
4 April — An anarchist shoots at The Prince of Wales during his visit to Belgium for the birthday celebrations of the King of Belgium.
4 April — Queen Victoria arrives in Dublin on a rare visit.
23 April–12 May — The Automobile Club of Great Britain stages a Thousand Mile Trial, a reliability motor rally over a circular route from London to Edinburgh and return.
24 April — The Daily Express newspaper published for the first time.
14 May–28 October — Great Britain and Ireland compete at the Olympics in Paris and win 15 gold, 6 silver and 9 bronze medals.
17 May — Second Boer War: Siege of Mafeking ends.
18 May — The UK proclaims a protectorate over Tonga.
5 June — Boer War: British soldiers take Pretoria, South Africa.
19–21 July — Bernard Bosanquet first bowls a googly in first-class cricket, playing for Middlesex against Leicestershire at Lord's.
27 July — Louise, Princess Royal, a granddaughter of Queen Victoria, marries Alexander Duff, Earl of Fife, in the private chapel of Buckingham Palace, London; 2 days later he is created Duke of Fife, the last Dukedom created in Britain for a person who is not a son, grandson or consort of the Sovereign.
The Duke of Albany becomes Duke of Saxe-Coburg and Gotha as Carl Eduard following the death of his uncle, Duke Alfred, a son of Queen Victoria who is the third of the reigning monarch's children to die.
Mines (Prohibition of Child Labour Underground) Act prohibits children under the age of thirteen from working in mines.
8 August — Great Britain loses to the United States in the first Davis Cup tennis competition.
14 August — An international contingent of troops, under British command, invades Peking and frees the Europeans taken hostage.
27 August — British defeat Boer commandos at Bergendal.
3 September — West Bromwich Albion F.C. move into The Hawthorns, a new stadium on the border of West Bromwich and Handsworth.
3 October — Edward Elgar’s oratorio The Dream of Gerontius receives its first performance in Birmingham Town Hall.
25 October — Second Boer War: United Kingdom annexes Transvaal.
22–14 November 1903 — Strike of Welsh slate workers at Penrhyn Quarry.
3 December — The Conservative Party under Lord Salisbury wins the 'Khaki' general election. Winston Churchill is elected Member of Parliament for Oldham; and two Labour candidates are successful: Keir Hardie in Merthyr Tydfil and Richard Bell in Derby.
28 December — The Liverpool barque Primrose Hill is wrecked on South Stack off Holyhead, with the loss of 33 lives.
31 December — A storm causes a stone and a lintel to fall at Stonehenge; they are restored in 1958.
Beer Scare: beer drinkers in North West England suffer poisoning from arsenic in brewing sugars: 6,000 people affected and 70 killed.
William Harbutt of Bathampton begins commercial production of Plasticine modelling clay.
Diamond Jubilee wins the English Triple Crown by finishing first in the Epsom Derby, 2,000 Guineas and St Leger, ridden by Herbert Jones.
Completion of the Arnold Cross estate, Shoreditch, London; Britain's first council estate to be commenced (10 years previously).
Ernest Bramah's oriental fantasy stories The Wallet of Kai Lung.
Joseph Conrad's novel Lord Jim.
Maurice Hewlett's historical novel The Life and Death of Richard Yea-and-Nay.
Gertrude Jekyll's book Home and Garden: notes and thoughts, practical and critical, of a worker in both.
Arthur Quiller-Couch's anthology The Oxford Book of English Verse 1250–1900.
H. G. Wells' novel Love and Mr Lewisham.
31 March — Prince Henry, Duke of Gloucester (died 1974)
27 May — Ethel Lang, née Lancaster, supercentenarian (died 2015)
30 May — Gerald Gardiner, Lord High Chancellor (died 1990)
6 June — Arthur Askey, comedian (died 1982)
25 June — Lord Louis Mountbatten, 1st Earl Mountbatten, naval officer and statesman (assassinated 1979 in Ireland)
4 August — Elizabeth Bowes-Lyon, later Queen Elizabeth The Queen Mother, queen consort of George VI (died 2002)
4 September — Maxwell Knight, spymaster and naturalist (died 1968)
9 September — James Hilton, novelist (died 1954)
1 October — Tom Goddard, English cricketer (died 1966)
6 October — Stan Nichols, English cricketer (died 1961)
8 October — Geoffrey Jellicoe, landscape architect (died 1996)
9 October — Alastair Sim, actor (died 1976)
16 October — Edward Ardizzone, painter, printmaker and author (born in Vietnam; died 1979)
20 January — John Ruskin, writer and social critic (born 1819)
22 January — David E. Hughes, musician and professor of music (born 1831)
31 January — John Sholto Douglas, 9th Marquess of Queensberry, nobleman and boxer (born 1844)
23 February — William Butterfield, architect (born 1814)
24 April — George Douglas Campbell, 8th Duke of Argyll, politician (born 1823)
30 July — Alfred, Duke of Saxe-Coburg and Gotha, second eldest son of Queen Victoria (born 1844)
22 November — Arthur Sullivan, composer (born 1842)
30 November — Oscar Wilde, playwright, writer and poet (born 1854)
1900 in the United Kingdom Wikipedia
Events from the year 1900 in the United Kingdom.