Site: St Stephen Walbrook (3 memorials)
EC4, Walbrook, 39, St Stephen Walbrook church
The blue plaque is below the Palladian window to the left of our photo. Before 2011 the square blue plaque was where the red information board now is, beside the doorway. The stone inscription is just inside that doorway, on the left hand side of the porch.
This church was originally further to the west. It was rebuilt on this site and consecrated in 1439. That church was lost in the Great Fire of 1666. The present building was constructed 1672-9 to a design by Sir Christopher Wren.
London Historians blog has some photos of the inside, including the original telephone used by the Samaritans.