Most of us welcome the coming of spring with relief, especially after a grey, cold winter. Across most of the world, sun is something we look forward to - there's a multi-billion dollar travel industry that relies on our love of sun, sea and sand. But it wasn't always that way, even in the decidedly non-tropical UK. Until only a couple of hundred years ago, nobody would dream of exposing themselves to the sun by choice. Women painted and powdered their skins to look as white as possible.