Just realised I never wrote down the Tommy and Tuppence ones.
"The Secret Adversary". Published in either 1920 or 1922 (sorry, forgot which one) this introduces us to Tommy and Tuppence. Opening scene is 1915 and the sinking of the Lusitania, then skips to the "present". Tommy and Tuppence are very young, combined ages of 45 and we learn in Partners in Crime that Tommy is older. Good story, very much an adventure as well as a detective story.
"Partners in Crime" a collection of short stories published about 1929 and which send up many of the popular fictional detectives of the early twentieth century and late nineteenth century. Usually by Tommy emulating them. Lighthearted reading and The Gentleman dressed in Newspaper bears similarities with The Affair at the Victory Ball.
"N OR M" A wartime Tommy and Tuppence. Reasonable, they're investigating a Nazi spy, though Tuppence is doing so undercover as has been ordered by their bosses not to get involved.
"By the Pricking of my Thumbs". Good, rather chilling and one of those cases where the roots of it are buried in the past.
"Postern of Fate". Probably the last story that Christie wrote, but no indication she intended it to be the last Tommy and Tuppence story. Quite poor to be honest.
I should have said of course that Tuppence is also very much like Bundle Brent. The logical conclusion would be that Tommy would be equivalent to Bill Eversleigh, but whilst Bill describes himself as "not such an ass as you think me" (think I'm paraphrasing a bit there), Tommy comes across from the start as being a bit more together, though still prone to acting recklessly at times.