2012
SU5746 : Unmarked ruin
taken 14 years ago, near to North Waltham, Hampshire, England

Unmarked ruin
I suspect this was too small for a dwelling, but nevertheless it was a brick structure. (My original comment).
UPDATE (2016), with thanks to MikeofDorset.
"The remains of the North Waltham WW2 civil bombing decoy control bunker that protected the town of Basingstoke. A combined 'QL' and 'SF' site, together they would have provided both special decoy lighting (QL), and explosive fire effects (SF or Starfish), simulating poorly blacked out residential or commercial areas under attack."
UPDATE (2016), with thanks to MikeofDorset.
"The remains of the North Waltham WW2 civil bombing decoy control bunker that protected the town of Basingstoke. A combined 'QL' and 'SF' site, together they would have provided both special decoy lighting (QL), and explosive fire effects (SF or Starfish), simulating poorly blacked out residential or commercial areas under attack."
