The stained glass windows in the south wall, which are by Lawrence Lee and date from 1949 to 1955, represent lost churches associated with the parish: St Magnus and his ruined church of Egilsay, St Margaret of Antioch with her lost church in New Fish Street (where the Monument to the Great Fire now stands), St Michael with his lost church of Crooked Lane (demolished to make way for the present King William Street) and St Thomas Becket with his chapel on Old London Bridge.