Out of curiosity, if the UK adopted the Official Party rule which Parties would have official status? These are all the Parties that got at least 1% of the vote in the last 3 elections. Votes are in the millions and is the total of the votes received in the last 3 general elections in 2017, 2019, and 2024.
In all of the last 3 general elections the Conservatives, Labour, and the Liberal Democrats got 5% of the vote. The Green Party only got 5% in the last election. UKIP/Reform got 5% in the last election, also in 2015, but not in the 2 elections in between.
Prior to the 2024 election the UK would have had 4 Official Parties; Conservative, Labour, Liberal Democrat, and UKIP. After this last election the Green party would have official status as well bringing the total up to 5 Official Parties.
The Federalist party of Canada 