"the Aerated Bread Company"
by cm
ABC Tea Shop in Fleet Street
Public DomainABC Tea Shop in Fleet Street

The Aërated Bread Company was both a bakery and a chain of tea shops.  Like Lyons Corner Houses, ABC Tea Shops were considered suitable for unaccompanied ladies to frequent, and so became popular as London's population of working women grew.

The company was founded in 1862 with a new bread-leavening technology that made use of carbon dioxide instead of yeast.  The company was acquired by Allied Bakeries in 1955, and the name was finally phased out in the 1980s.