The trouble is, it's all a bit gritty and macabre for my tastes. I suppose that's what you'd expect if you mixed The League of Gentlemen with the cryptic crossword plots of Steve Moffat - like Torchwood, only well-written (so, ahem, not like Torchwood at all then). It's not Morse or Lewis, with their dreaming spires. Jonathan Creek elucidates the "science" of deduction in a contemporary way, I think, that has no ambition to be anything more than light entertainment. The period element of Holmes, or Poirot, puts the criminal classes a sufficient distance away. (The preponderance of 60s/70s wallpaper does not score it on this point.) Victoria Wood had something when she said of Dad's Army: If you don't want something to date, then set it in the past, because it's already dated.
But I'd probably watch if they do another series.