Armada House is in Telephone Avenue, Off Baldwin Street, BristolIt was built in 1903 by Henry Williams, and is now used as offices and a conference centre. It has been designated by English Heritage as a grade II listed building.It was formerly the offices of the National Telephone Co.In 1971 one room was equipped by Post Office Telecommunications as a Confravision studio.From 1983 the second floor was used by British Telecommunications as "Telecom TAN", one of the first commercial call centres & messaging bureaux in the UK.