Strictly speaking, this isn't really setlock. But it reveals enough of a scene from s3 ep1 that I'm treating it as setlock.
Ben posing with setlock fans -- lots and lots of fans, courtesy of Buzzfeed.
Look, it's Lestrade! Mark's so cool.
What is John wearing? Why are you laughing, Ben?
How can Ben/SH look so hot?
John watching Sherlock at door. Sherlock and John -- and whose coat's behind them?
Behind the scenes of ep2. ETA: Buzzfeed shows some mild setlock Tweets here.
A photoset of Ben, Martin, and Amanda on set. When you're off to watch setlock, Amanda wishes you well. 8)