These two structures are a bit of a mystery. The surviving structure clearly resembles something from the First War - many similar structures were built by both the Germans and British in low lying areas such as Flanders where it was not possible to dig trenches. They were normally used as Command Posts or troop shelters. However these are in Suffolk! They clearly do not relate to defences constructed in Suffolk during the First War as they are not shown on a Luftwaffe aerial photo I have a copy of dating from the Summer of 1940. I am also certain they are not on an RAF photo taken sometime in 1941 (although this is less clear than the Luftwaffe photo). The only reference I have come across that refers to these structures is a memo from HQ 21 Army Group giving permission for 79th Armoured Division Assault Royal Engineers to make use of "the concrete structures referred to on Scotts Hall A Tk range as you see fit" - i.e. blow them up as part of trai...