Holdfast has pretty much saved me from posting by saying what I'd wanted to say. Conan Doyle this is not - Jeremy Brett's crown is safe in that regard, I think. But this was an interesting re-imagining of the characters and some of the concepts into a different environment.
Interesting what our resident shrink says about diagnosis - I was amused by that discussion as I've heard many arguments that Conan Doyle's Holmes is bi-polar, drug dependent etc (interesting hints at that, too, with the nicotine patches and the drug raid - swapping a 'three pipe problem' for a 'three patch problem'.)
Overall, I enjoyed it and will stay up to watch next week. Or record for watching another night as there's so little on TV these days.