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Walk out of the clinic and head towards the alleyway that leads back to Commercial Street. You will run into Big Danny. She is looking for customers willing to buy an entirely different kind of meat. As much as you may not wish to do so, you must talk to her to find out where Hardiman the cat food seller currently resides.
Learn that the cat meat seller lives at 29 Hanbury Street. This is the same location where Anna Chapman passed away. Use the map of London to get to the street. Hardiman issues his peculiar “beep beep” call before you enter the meat store here. Talk to him and found out that he broke the key for the shop.
He says that there is another key, but you must go upstairs to get it. Walk up the stairs and find the remains of the butcher’s work here. Find a small piece of the broken key. You need to find a simple blade, perhaps from a door that does not guard anything important. The outhouse in the backyard where you found Anna Chapman’s body contains a simple blade. Get the key from the door, and head back to Hardiman. Watson tells Hardiman to meet Holmes and him at the butcher’s shop in Wharfdale in about an hour with twelve pigs heads.