After turning down the job of royal physician to King George III – perhaps a lucky escape, considering the monarch's descent into madness – Erasmus Darwin became a leading light in the Lunar Society, debating the origins of life with luminaries including Wedgwood, Boulton and Watt decades before his grandson Charles came up with the theory of evolution. The former house of the 'Grandfather of Evolution' contains some intriguing personal effects. At the back, a fragrant herb garden leads to Cathedral Close.