Favourite Sherlock set/location

For sheer awesome in set dressing - as I honestly don't know if they went to the Palace to film - this one has to win. *grins* I've been to Buckingham Palace and, if you look closely at the left most area of the exterior shot, that's the gate I had my picture taken at. The lake area is St. James's park, and a delightful walk in the afternoon. The other win thing about this set is the joke they're able to get in at Mycroft's expense. (Here to see the Queen?)