The picture show the Hertfordshire Regiment in from of Mayflower Place. It is the 3rd Battalion, Herts Home Guard, number 3A Company, number 1 Hertingfordbury Platoon.
Fire Watchers at Apsley Mill, Hemel Hempstead
The 4th Battalion Herts Regiment of the Home Guard, 1940 
Training exercise with a Blacker Bombard Spigot Mortar No 3
Training in 1940