Fraser Bond are the leading lettings and property management agents for Leadenhall Market - London EC3V. Leadenhall Market is a Grade II* listed historic market building in the City of London EC3. History The current Leadenhall Market was designed by Sir Horace Jones and built in 1881. Wrought iron and glass replaced the previous stone structure. In the Movies Used as Diagon Alley in Harry Potter and the Philosopher’s Stone. Historic England List Entry Number: 1286182. Date first listed: 05.06.1972.