{Around a Union, or Tudor, rose:}
An English Listed building
The portcullis plaque to the left is a fire insurance mark of the Westminster insurance company like this one at the Museum of London.
Site: Listed Building - SW14 (1 memorial)
SW14, Thames Bank, Leyden House
This is the Listing entry. Most owners of Listed houses do not feel the need to erect a plaque, though we have found another, in Tufnell Park and then, two days after seeing this Mortlake plaque, we saw another one on 9 Idol Lane EC3, still to collect. But we do find them rather dull.
Note the steps and wall protecting this riverside building from flooding.