I came out of Bond Street underground station one morning last week and noticed the elaborate terracotta sign signalling the premises of John Bolding & Sons, of Grosvenor Works in Davies Street.   It was a company founded in 1822 in South Molton Lane, a manufacturer and supplier, as the sign says, of sanitary appliances – the highest quality basins and baths to the residents of Mayfair and beyond, made often in brass and technologically sophisticated.   It bought out its rival, Thomas Crapper, in 1966, only to go bust three years later:-