I was at NMGS from 62-69 and remember Sibson well. As he was walking in some of the 6th form started tapping their feet in time to his. Nobody fessed up so he picked a class at random to get the belt. We’ll I was in that class. I remember Blackwell. He was the PE teacher and made me captain of the athletics team in my last year there. I also ran on the cross country and tennis teams. I have been living in the USA since 1975 and was there last Dec for mum’s funeral