Sir: Growing up in the west Monmouthshire valleys, I knew only "daps". Arriving as an 11-year-old new boy at an east Monmouthshire school, I was told to collect my "pumps". The schoolmaster misread my confusion for insubordination. He was furious - or, as Frank Harris-Jones (letter, 20 March) would understand, "tamping mad".
Professor RICHARD CARWARDINE