The Rest is History @TheRestHistory — insightful and also very entertaining. Particularly loved the series on the falklands war.

The Rest is History History, on Fire

pod is excellent, with some rather varied topics.

Recommendation: I've learned from father/grandfather that there is no greater pleasure in life than a free-flowing conversation with an erudite person: 1) @holland_tom is about the most erudite person I've met West of the Alps, 2) His podcasts feel like a conversation.