Fans used the hashtag #setlock to assemble and try and get a piece of the action.
North Gower Street was transformed to resemble a different London address.
Benedict Cumberbatch has been continuing his new hobby of holding out signs.
This time he referenced the recent scandals in the U.K. following the detention of David Miranda at Heathrow Airport. Last week he had a provocative message for paparazzi in Cardiff.