[ken5050]

I can’t remember the exact details, and don’t have time to start Googling..but during the Blitz, there was one very tragic incident. A V-1 hit a school, and 20 or so very young kids and several teachers, were killed. There’s a very famous picture of all the victims..a class pic taken a few weeks before the event..

[naturalman1975]

Not sure if it's the one you are thinking of, especially as it didn't involve a V1, but the Sandhurst Road School Disaster comes to mind - 20th January 1943. A 1000lb bomb fell on the school, killing 32 children and six staff.