CL1, Curious now, what did the building defend? The school or the location? Checked mapping via: Contact usĀ | Merchant Taylors' Prep School and nothing obvious to a distant observer. I have sent the link to a pillbox enthusiast.
David I think it was the general idea to be not spotted The whole area has and did have pill boxes as part of the outer London defence line and it sits bang on the line. I belong to the pill box study group hence my anorakish behaviour on all things that were and look like WW2 UK defences plus many other things. regards Clive