The BBC 4 series Going Classical features the BBC orchestra and world-renowned singers or musicians performing in some of the UK's most beautiful halls. In this case we have the orchestra performing a new piece with Mark Gattis and Sanjeev Baskar as Holmes and Watson re-telling the story of The Hound of the Baskevilles.
I think this was the best piece of TV I saw (or more accurate listened to) over the holiday period. For more information see this link.
You can still enjoy it on BBC iPlayer. Highly recommended.