Caroone House was an office block at 14 Farringdon Street, London EC4, which was built in 1972 on the site of the Congregational Memorial Hall which had been demolished in 1968.

A Greater London Council plaque commemorating the foundation of the Labour Party at the Memorial Hall in 1900 was displayed at the main entrance to Caroone House.

Among other things it was the HQ for managing the operation of ITps International Control Centres (ICCs) in London, Brighton and Glasgow.

It was also HQ for what was, at the time, the world's largest international telecoms exchange located on the site of the old Stag Lane Aerodrome in Edgware.

[4] The Stag Lane exchange was later superseded by BTs new international switching centre (ISC) at Mondial House.