Robert Sheppard made some interesting points in his recent letter with regard to our weather and climate change. Under the Roman period there was at least one vineyard in Lincoln whilst much further on it was possible to skate on the frozen River Thames! Much closer to our time, many readers will possibly remember the snow falls that occurred during the second world war and in 1947 which curtailed our aircraft from taking off until the runways were cleared and transport generally curtailed. Living on Merseyside post-war I remember snow usually stayed on the open ground in our parks and elsewhe…