Diggory Passage is a passage in Walford, is between Victoria Square and Daisy Lane. The sign was first seen in the a behind the scene video of Eastenders and then later seen in the Smasher Dance E20 advert for EastEnders E20.
Diggory Passage Entrance via Albert Square (2009)
Diggory Passage Entrance via Victoria Square (2015)
Smasher Dance E20 Advert