OK - this was my least favourite episode. Why? Two main reasons ... first of all Russell Tovey, despite the tongue-in-cheek casting of 'George the werewolf' from 'Being Human' in the hounds story, he was lame in my opinion ... and detracted from the story telling, making it less scary and more cringeworthy than it should have been ...
and secondly ... Sherlock looking down a microscope to look for poison in the sugar! really? crystals of poison could have looked just like sugar crystals ... he would have needed a chemical analysis to detect any drugs etc in the sugar ... and as for the swirling images and chemical symbols ... there was even H2O circled, which most of us would recognise to be water, after all we're into 'Sherlock' because it doesn't insult our intelligence and this ... this did for me ... and I grumbled when I saw it ...
but it was nice to see them out in the Countrycide ...ooops I mean countryside