The Great Hall did not completely escape damage in the Great Fire of London in 1666 ; it was partially restored ( with a flat roof ) in 1670 . The present grand entrance ( the east wing of the south front ) , in " Hindoostani Gothic " , was added in 1788 by George Dance ( and restored in 1910 ) . A more extensive restoration than that in 1670 was completed in 1866 by the City of London architect Sir Horace Jones , who added a new timber roof in close keeping with the original hammerbeam ceiling . This replacement was destroyed during the Second Great Fire of London on the night of 29/30 December 1940 , the result of a Luftwaffe fire-raid . It was replaced in 1954 during works designed by Sir Giles Gilbert Scott , but the original hammerbeam design was not retained
Second Great Fire of London
Second Great Fire of London
Guildhall, London