Labour currently have a large majority but it is on the lowest share of the vote for a winning party since such records began in 1830, and the last election was about clearing out a government that ended up with its worst results in a quarter of a millennium. It does not need much of a swing for them to lose their majority and many predict they will, but much can happen in the next 4 years. Here are what seem the possible scenarios.
The only way I see Labour getting an overall majority is if history repeats itself: Reform splits the right-wing vote the same way the left-wing vote was split in the 1980s between SDP and Labour. Plausible as Reform’s potential target seats would be quite a stretch to gain and in 2024 there were many Conservative seats lost by margins less than the Reform vote share. This is made more likely if the Conservatives go down the road of trying to “win back” Reform voters rather than differentiating themselves.
Just the name “Reform” UK is influenced by Reform wiping out the Progressive Conservatives in the 1993 Canadian general election, but that still left the Canadian Reform party in third place with 52 seats while PC lost 154 and it would be 13 years before they evolved into a governing party. A British Conservative wipeout would mostly benefit Labour. Mechanics are different but its effects would be much the same as the 1980’s split vote.
Conversely I can foresee a Reform-Conservative coalition since they seem ideologically if not tribally compatible, and if Reform is really going to model itself on the LibDems this will involve highly targeted campaigning aimed squarely at Labour in the Midlands and the North. Such localisation would limit damage to the Conservatives and realistically this is the only way Reform will be in government in a single electoral cycle.
It is theoretically possible for the Conservatives to win an overall majority but that would be a two-front battle with Reform and the LibDems. In 2019 Boris Johnson successfully gambled with anti-Brexit southern seats but a lot of these have now flipped LibDem and a campaign aping Reform’s anti-Europe platform would not go down well.
A coalition involving the LibDems is possible if they manage to hang onto the bulk of their 72 seats, which in turn requires them to seriously think what sort of party they want to be at the national level. A bit too much of their 2024 campaign ventured onto cheap NIMBYism so it needs to be something bold such as modelling themselves after the German FDP rather than a soft-left party. However LibDems represent areas which would want to see a Labour government gone so a Labour-LibDem coalition would be a hard sell, and the party itself would not be willing to go into coalition with the Conservatives as readily as in 2010.