This is how I see the lay of the land.
Labour win comfortably.
Tories less than 100 seats.
Lib Dems do well.
Reform do well in vote share but take few seats (1-5 range imo).
After they're in, Labour start to get pulled from both sides, not left enough for LD and Green types, pressure also comes fromTories Reform and right Tories on immigration and culture war issues, Starmer tries to appease both sides, pleasing neither, struggles to get things done.
2 years in the left are unsatisfied with what they see as tory-lite centrism, the right get more vicious and use any political failings or inaction to stick the knife in, the current problems we have remain unsolved and early polling data splits people even further into far-right and far-left as people lose even more faith in traditional parties. 2029 election will be contested by what we now refer to as third parties.