This film obviously takes its casting from the portrayals of Holmes and Watson by Rathbone and Bruce, rather than from the book. Richardson is smarmy, jovial and cheery, with none of Rathbone's cold precision and sharpness. Churchill is more idiotic as Watson than even Nigel Bruce could manage. An insipid and clueless Inspector LeStrade is added for no other reason, apparently, than the writer's feeling that a Holmes story needed him.
The sets looked good. Some of the additional characters are quite well done (with the exception of the butler and his wife, who sleepwalk through their lines.)
This film pales next to almost any of the other film adaptations of Hound. The best is the Rathbone/Bruce version. The Hammer films version gives us Peter Cushing as an excellent Holmes surrounded by those lovely Hammer sets.
The 1988 Jeremy Brett TV film suffers from being filmed on a TV budget, but gives us what is probably the most faithful rendition of Holmes and Watson, with Watson coming off as Holmes' strong right hand, rather than as a buffoon. Watch any and/or all of these, but only watch this version if you have run out of other versions to watch.