The Torchwood Institute is an organization based in Brittain, tasked with protecting the British people from extraterrestial and other unusul threats.
Torchwood One, London
Torchwood One is the branch located in London, England. It was one of the larger, if not the largest branch of the organization. This branch's main base of operations was the Torchwood-tower, a skyscraper located in Canary Wharf.
This branch employed hundreds of emplyees, from researchers to soldiers to officer workers. It was led by Yvonne Hartman.
During the battle of Canary Wharf most of the emplyees were either killed or conversted by the Cybermen.
Torchwood Two is the branch located near the River Clyde in Glasgow, Scotland. Jack Harkness desrcibes it as "an office in Glasgow with a very strange man".
Torchwood Three is the branch based in Roald Dahl Plass in Cardiff Bay. This was branch was led by Jack Harkness and monitored the Cardiff Space-Time Rift.
Jack Harkness describes it as "missing", caused by the Last of Erebus, a powerful locket.