Administrative matters relating to the county of Middlesex were immediately transferred to the Guildhall in Parliament Square.

London County Council took over management of the Sessions House and continued to use it temporarily for magistrates' courts in its area.

[4] From 1931 to 1973 the former Middlesex Sessions House served as the headquarters of Avery Weighing Machines, manufacturers of weighing-machines and scales.

[8][9] The Sessions House is substantially larger than Hicks Hall and was built in the classical style with four huge Ionic order columns supporting a pediment.

[1][10] Above the central window was a relief of the head of King George III carved by John Charles Felix Rossi and Giovanni Battista Locatelli.