Reasons to be Cheerful isn’t necessarily a ‘leftist’ podcast (One of the hosts is the former leader of the Labour party in Ed Milliband), but the show spends a lot of time talking about leftist ideas to improve the world.

“Well there’s your problem”, about engineering disasters - it’s also a YouTube channel but there are podcast feeds and it works as audio (that’s how I listen). Also “Know your enemy” is a leftist look at the right.

Working class history

Popular front even tho it isnt what i would call lefty but it does cover interesting conflict/protest stuff

Behind the Bastards

Adding:

• ‘Tech won’t save us’ (Leftist/Marxist critical Analysis of Techtrends)

• ‘Trashfuture’ (About the absurdity of Start-up Culture and UK Politics)