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There's a new head who has introduced some complicated colour-coded behaviour system so I presume they will use this. In the old days I would have gone in this morning to see the deputy head but this is no longer allowed (another new rule introduced on Monday), although if I thought it wasn't being dealt with I would have gone in regardless. I have every faith in the deputy head to deal with it appropriately (within the constraints of the new system). If she is unable to sort it out due to the new rules, and it continues/escalates I'm not adverse to having 'a word' with the mother (which will go in one ear and the other).