Middlesex Guildhall

The Middlesex Guildhall is the home of the Supreme Court of the United Kingdom and of the Judicial Committee of the Privy Council. It stands on the south-west corner of Parliament Square in London.

The location in Parliament Square was the site of the belfry of Westminster Abbey and it was used as a market from 1750 to 1800. The justices of the City and Liberty of Westminster took it over and an octagonal guildhall with a Doric portico was constructed by Samuel Pepys Cockerell in 1805. In 1889 Westminster became part of the County of London, outside the county of Middlesex. In the division of property between the Middlesex and London county councils, the guildhall at Westminster went to Middlesex in exchange for the Middlesex Sessions House in Clerkenwell. A neo-Tudor guildhall was constructed on the site in 1893 by Frederick Hyde Pownall.

More information on the Wikipedia page