Can anyone point me in the direction of a CLEAPSS document that says students should not be allowed in labs unsupervised? Common sense, I know, but I need something to wave at SLT 
We're currently having an argument with SLT insisting teachers need to be on the corridors during lesson changeovers because the behaviour is so bad, but with an L shaped corridor and weird shaped rooms that leaves either students in classrooms unsupervised or students on the corridors unsupervised - I need something to wave at SLT to say teachers have to be in the classrooms once there's a student in there so they make provisions for an SLO or similar to be on the corridor (and ideally update our CCTV so it covers the whole corridor, but that might be optimistic)
I've had a look myself but can't find what I need, so help needed please!
We're currently having an argument with SLT insisting teachers need to be on the corridors during lesson changeovers because the behaviour is so bad, but with an L shaped corridor and weird shaped rooms that leaves either students in classrooms unsupervised or students on the corridors unsupervised - I need something to wave at SLT to say teachers have to be in the classrooms once there's a student in there so they make provisions for an SLO or similar to be on the corridor (and ideally update our CCTV so it covers the whole corridor, but that might be optimistic)
I've had a look myself but can't find what I need, so help needed please!