I second the recommendation for Margery Allingham’s books about Albert Campion, who like Wimsey is a charming, upper-class sophisticate who hides behind a facade of being an obtuse silly ass. It’s almost an alter ego, Scarlet Pimpernel type of thing. He’s clever, self-deprecating, mysterious, and also a touch dashing now and then.
However, despite their similarities I like Campion way more than Wimsey. A big plus is that Allingham didn’t fall in love with Campion like a drooling bluestocking fangirl the way Sayers did with Wimsey – and there’s certainly no Mary Sue like Harriet. Heh, I guess you can tell that, like Exapno Mapcase, I kinda detest Wimsey. So you might wanna take my recommendation with a grain of salt.
But if you’re going for a likeable character, I will wholeheartedly without a drop of reservation recommend the Nero Wolfe books by Rex Stout. I agree that they have an American sensibility, but there’s also a strain of the English cosy feel to them; part of Stout’s genius was to combine the American hard-boiled with the English cosy style. And there’s simply no more likeable, witty character in the mystery canon than Archie Goodwin, who narrates the books and is Wolfe’s legman, employee, partner, cockleburr, and chief cattle prod.
Between Wolfe’s book-loving, multilingual, eccentric sophistication and Archie’s breezy, snarky romanticism, the pair are a unique treat to read. Plus there’s the delight of stepping into a New York where women wore gloves and men wore hats. (The books take place anywhere from 1934 - 1977; Stout always wrote them as contemporary, though the characters thankfully don’t age. But most of them are from the 40s - 60s, and there’s a historical charm to them.)
Rube E. Tuesday, I gotta agree that Archie and Wolfe would’ve rolled their combined four eyes at the Wimsey/Vane set. At least Wolfe would be able to fling some good insults at them in their oh-so-pretentious Greek – and unlike them, he’d use his own verbiage, rather than quoting others’ words back and forth.