Reform gutted the Tory party largely on anger over immigration the Tory party itself whipped up.
Their incredibly incompetent string of PMs didn't help, but without Reform spoiling, they'd at least still have had a shot.
Note how Labour didn't win this as much as the Tories lost it: Starmer got fewer votes than Corbyn. Starmer failed to attract more voters despite running against the most ridiculed government in modern British history. People didn't want Starmer, they wanted not-Tories, and on the right that meant voters fleeing to the anti immigrant Reform.
Their incredibly incompetent string of PMs didn't help, but without Reform spoiling, they'd at least still have had a shot.
Note how Labour didn't win this as much as the Tories lost it: Starmer got fewer votes than Corbyn. Starmer failed to attract more voters despite running against the most ridiculed government in modern British history. People didn't want Starmer, they wanted not-Tories, and on the right that meant voters fleeing to the anti immigrant Reform.