A generation of south Wales social history formed the background to the life of my wife, Mary Renshaw, who has died aged 83. Born in Newport, south Wales, to Irene (nee Byrne) and Isaac Davies, she grew up in the pit village of Cwm just south of Ebbw Vale in Blaenau Gwent. Her father was a steel worker during a period when the second world war and the postwar economic boom brought prosperity to a region that had earlier felt…