There's a plain and fundamental issue here, due to who actually controls the narrative. Most would consider Corbyn and his policies as 'far left' because they've been told they are, I consider myself a socialist as a starting point,but pragmatic to existing vircumstances and systems, and I would describe Corbyn/policies as 'slightly' left of center, democratic sovialist using the European model.
The 'far right' only ever get spoken about in terms of absolute raving nutjobs like Brevik, even oor Tommeh gets off lightly in comparison to Corbyn, yet his posturings are a bigger threat to democracy in this country. And he hasn't offered everyone free (costed) wi fi.
It was the media that turned the last election into a 'brexit/immigration' election, ignoring the foodbanks, nurses and nhs situations, and the economy.
As for Starmer and Blair, take them on political points alone, one a genocidal warmonger who lied to use depleted Uranium on civilians, or the second, who supports genocidal maniacs using white phosphorous on children.
The choice you have is not to swallow the chopping and changing legitimacy seeking rhetoric they all spew but to go with ahumanistic approach of who of all would benefit the most people with their policies, but that would be too socialistic for some to consider, lest they became agents of the KGB.