I have lived through the British public, time and again, voting conservatively and rejecting anything which smells of socialism.
And yet the party moving significantly to the left for the 2017 election meant for the first time in 20 years they gained votes and seats. So its not quite as clear cut as that is it? And leaders like Miliband, Brown, Kinnock all took the party to the right and lost anyway.
Honestly 10 years ago I'd have agreed with you but the Corbyn years were an eye opener. The reasons a left wing Labour seemingly can't win are IMO all within the party, not because of the electorate. It's the MPs, the central office staff, the party grandees. They close ranks and make sure it can't succeed.
I do expect social policy to become more compassionate; affordable housing and more equal regional development to be made priorities; more devolution at local level; more joining of public procurement to sustainable social good; the state to be far more muscular with regard to industrial policy; reform in education away from 'gradgrind'; some sort of National Care Service; a sustained squeeze on 'wealth', albeit stealthily; a signally 'closer' relationship with the EU etc.
Hope you're right. I can't see where you get most of that based on what Starmer, Reeves and Streeting say publically. More devolution? He hasn't even been letting CLPs pick their own candidates. A national care service at the same time as Streetings busy privatising the NHS? Doesn't make sense. Rachel "not the party of benefits" Reeves squeezing wealth?