At this stage it is just posturing, probably to see how helpful or the opposite the teacher unions are. There can be no doubt Boris will remove the SD rule shortly before September if the infection and death rates continue to be low or hopefully close to zero. He, we and everyone knows it is the only way to get schools re-opened fully as he has said they will. The government is just sparring with a union that has the bit between its teeth and which out manoeuvred the government this side of the summer break. The unions will not be allowed to do that again.