The best current British detective story...
is not Sherlock Holmes.
I don't mean to say that the modern reincarnation of Sherlock Holmes is poor quality TV. But it's much harder to like a TV show when the main character is so unsympathetic.
However, those who know the wonders of PBS/BBC Masterpiece Theater should know about another series, available for free (for a couple of weeks, at least) on the PBS website. It's called "Endeavour." Excellent detective story, sympathetic main characters. One of the better Masterpiece shows out there (and Masterpiece shows are usually pretty high quality, so that's saying something). Of course, I'm judging it entirely off the first episode. We'll see what next week brings.
Check it out.