This has been interesting. We installed our security procedures after Dunblane, but haven't really thought it through. We don't have (at present) any way of communicating with the classrooms to tell people to stay put, though we have a scheme to communicate a problem. Nor do we have a drill apart from fire drill, modified to allow for a bomb scare, so that people would know how to react. We don't really believe in the possibility, I guess.

Penny