Greenville
Banned
The challenge is to at some point between the year 1900 and 2000 to cause Great Britain to dissolve the monarchy and become a full-fledged republic government.
The problem is that it would take an awful lot to get Labour, or any other major party for that matter, to adopt a Republican platform without first having some major constitutional crisis where the monarch intervenes in politics to a degree that is blatantly unacceptable, and extremely unlikely. Attlee would never have called for a Republic whilst he were leader, for one thing, because he was a firm monarchist, even calling the 1951 election early so that it could fit in with the Kings schedule, when it might have cost Labour victory.Then in the General Elections of 1945 Labour wins on a platform that says that a new Britain does not need royalty to be Great.
Indeed, can you imagine Diana at William's wedding, she'd push Pippa's bottom out of the way and steal the limelight.God knows why Diana was popular. Camilla is a far more professional Royal and has aged better than her peers (no pun intended).
Pros of the Monarchy:
They are apolitical all the colours of the political world can support them.
They are relatively cheap a President would need all sorts of shiny toys every time he/she is elected, the Queen is still using her greatgreatgreat grandfathers cutlery.
We get to have a big wedding or Jubilee every few years which means a Bank Holiday and a street party.
It annoys foreigners.
Cons of the Monarchy:
For political reasons the govt of the day sometimes invites repulsive foreign politicians for a state visit and the Queen has to be polite even when she wants to vomit on them.
Some of the members of the Royal family have an unhealthy obsession with killing wildlife.
Harry for King he would throw the biggest party ever the whole country would be drunk for a week and we would have the hottest Queen ever, all hail Queen Meghan Markle.
Oddly, I think this is the most likely ending to a 20th century British Republic.God knows why Diana was popular. Camilla is a far more professional Royal and has aged better than her peers (no pun intended). The issue would have never happened if 'Madge' hadn't decided that Charles couldn't pick a divorcing partner. He should have stuck to his guns and challenged the Establishment to a show down. I can't see any Labour PM calling a referendum that sought to exclude divorced people; especially in the 1980's.
The simplest, most likely and least dramatic POD is a more energetically socialist Labour government abolishing the House of Lords and Monarchy. It certainly wouldn't then be His Imperious Highness Blair as he sought to eradicate socialism from the Labour Party.
Someone once wrote an amusing ATL where the Labour PM pushed through a change to a Republic via Parliament and then all of the Armed Forces refused to change their oath and attestations from one to the Queen to one to the 'President' and thus effectively resigned en masse. The PM then demanded that they all be arrested and charged with mutiny but the Police then resigned. He then demanded that the Police be arrested for effectively striking in contravention to their contracts but the Judges and Magistrates all resigned too and the Civil Service announced a strike in support so he was left with no way to enact anything. Charles raised the Queen's standard at Oxford and a massed loyal demonstration marched to London and physically ejected the PM and MPs from the House and ran a referendum himself. The entire cabinet were charged and found guilty of High Treason under the Treason Act of 1945 and exiled to the Falkland Islands for life. There is probably a book in there somewhere. I felt sorry for the Falkland Islanders.

Two possibilities:
- George V makes some critical mistakes - he never changes his family name to Windsor, and gives Nicholas II asylum after the February Revolution. Make the 1917-1920 period more touch-and-go in terms of staving off revolution, and it's conceivable that the British Establishment might have thrown George and his family under the bus.
- Edward VIII not only refuses to abdicate in 1936, but actually tries to use military force to keep himself on the throne.
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It started when Gusty Spence was killed before he could set up the UVF and The UDA was too weak in order to fight the R.I.A. This lead to a R.I.A victory when British soldiers were evacuated from Belfast Harbour. The real and provisional R.I.A made a joint government in the north in order to join the republic. But many R.I.A members hated the very existence of the union. So in secret Many R.I.A members launched terrorists attacks against the UK. Because of this. The public demand the British government to stop the R.I.A but the UK can not. Over the next following years the UK fell to anarchy and the monarchy fled to Canada and from the ashes Came THE UNITED REPUBLIC OF GREAT BRITAIN