Reference your E.
Brunning, Buttfield and Mr Roberts (ex RAF) were all killed when a bomb released by a Ju88 went through the entrance of the air-raid shelter in which they were sheltering. (All were met personnel, but only Roberts was on duty.) My understanding is that there were 39 fatalities in the shelter - no survivors. I think all those on your list were almost certainly in the shelter.
So far as Roberts is concerned there is no Orpington Urban District Cemetery (as I found having spent ages looking for it), he is buried in St Mary's Cray Cemetery. I have a photo should you be interested.