Difficult to precisely date this but I would guess by the clothes and cars that this photograph was taken in the 1940s, around the end of the Second World War.
Air raid shelters had been built under Richmond Green for the people of the town to seek refuge from German air attacks. Over 450 separate bombing incidents pummeled Richmond during the war. They killed nearly 100 people, and badly injured almost another 400. Richmond suffered its worst single night of destruction on the 20th of September 1940. The entire street of 49 houses in Peldon Avenue were all completely destroyed when it took a direct hit.
See more on why the Maids of Honour was built here