The Cenotaph was designed by the architect Sir Edwin Lutyens, in the years 1919-20. The railings were made a few years later and are erected around the memorial each Remembrance Sunday.
I was commissioned to carry out an analysis of the paint on the railings. 32 schemes of grey paint were revealed and bronze paint had always been applied on the crown.
A short film clip of Armistice Day 1921 (presumably before the railings were made):
View Larger Map