Britain's richest street: The place by the palace, where the average house price is £19.5m

By ARTHUR MARTIN and JAMES MCMEEKIN The figure is 93 times the national average house price of £205,985. Even a single square foot of land in the street would cost you £1,193.They are beyond the reach of mere mortals. In fact, the homes in Kensington Palace Gardens would be too pricey even for many celebrities, bankers and lottery winners.A string of eye-watering property deals has helped to turn