There's a few in Hampstead on the aptly-named Cannon lane. https://livinglondonhistory.com/the-history-of-hampsteads-old-parish-lock-up/ https://livinglondonhi

There's a few in Hampstead on the aptly-named Cannon lane. https://livinglondonhistory.com/the-history-of-hampsteads-old-parish-lock-up/ https://livinglondonhistory.com/the-history-of-hampsteads-ol...