Belgravia and Knightsbridge represent the wealthy face of modern London, but it was not always that way. Belgravia did not exist before the 1820s, its site a bleak expanse of open countryside. Knightsbridge was a straggling settlement along the main highway from the west. Proximity to London and the Royal Parks was the key. Grand mansions arose in Knightsbridge and on the 'Five Fields' a classical townscape took shape from the 1820s - they called...