These included: The Hall Woodhouse family, prominent surgeons from the 1870s to 1910s - as to №1 John Wallop, 3rd Earl of Portsmouth and family in 1823 - as to №2 Royal Agricultural Society in the 1880s - as to №12 Ibbs & Tillett event promotion - as to №19 John Egerton, d.1787, Bishop of Durham and his wife, daughter of local magnate the Earl of Portland- as to №23 Gallery References Bibliography Sir John Summerson, Georgian London, London: Penguin, 1969 (revised edition) Edward Walford, Hanover Square and neighbourhood, Old and New London: Volume 4 (1878), pp. 314–326. External links Mayfair Squares in the City of Westminster Garden squares in London