Every so often there comes along a new daft idea (or a newly-packaged old idea that has been mangled out of recognition (and thereby rendered useless) so that its “inventor” can be designated as a guru. Me? Cynical? Never!) One of the more unfortunate manifestations of this phenomenon was the three part lesson. It sounds good and logical, but then the thing that usually happens happened: Ofsted started insisting on it, and Headteachers demanded to witness it in every lesson. Woe betide the brilliant but hapless teacher whose lesson plans failed to include the three parts.