In October 1922, the ticket office was replaced by a facility in the lifts. Passenger numbers remained low: when the station was one of a number on the network considered for closure in 1929, its annual usage was 1,069,650 and takings were £4,500. The branch was again considered for closure in 1933, but remained open. Wartime efficiency measures led to the branch being closed temporarily on 22 September 1940, shortly after the start of The Blitz, and it was partly fitted out by the City of Westminster as an air-raid shelter. The tunnels between Aldwych and Holborn were used to store items from the British Museum, including the Elgin Marbles. The branch reopened on 1 July 1946, but patronage did not increase. In 1958, the station was one of three that London Transport announced would be closed. Again it survived, but the service was reduced in June 1958 to run during Monday to Friday peak hours and Saturday morning and early afternoons. The Saturday service was withdrawn in June 1962. After operating only during peak hours for more than 30 years, the closure announcement came on 4 January 1993. The original 1907 lifts required replacement at a cost of £3 million. This was not considered justifiable in relation to the passenger numbers using the station and it was losing London Regional Transport £150,000 per year. The Secretary of State for Transport granted permission on 1 September 1994 to close the station and the branch closed on 30 September. Recognising the station's historical significance as a mostly unaltered station from the early 20th century, the station was given Grade II listed building status in 2011. Office floors above the station are used by the Classics department of King's College London. Although the Piccadilly Circus to City of London branch proposal of 1905 was never revisited after its withdrawal, the early plan to extend the branch south to Waterloo was revived a number of times during the station's life. The extension was considered in 1919 and 1948, but no progress towards constructing the link was made. In the years after the Second World War, a series of preliminary plans for relieving congestion on the London Underground had considered various east-west routes through the Aldwych area, although other priorities meant that these were never proceeded with. In March 1965, a British Rail and London Transport joint planning committee published "A Railway Plan for London", which proposed a new tube railway, the Fleet line (later renamed the Jubilee line), to join the Bakerloo line at then run via , , , Aldwych and into the City of London via , and before heading into south-east London.