I was once blackboard monitor at school,' said Vimes sharply.

I was blackboard monitor for a while, too.'

Blackboard monitor.

You cannot go down there, Blackboard Monitor Vimes!'

'I've rather gathered that,' said Blackboard Monitor Vimes.

Vimes was educated at a dame school, where he was once blackboard monitor for a whole term, before he had to drop out and concentrate on learning about life out on the streets.