Tilbury Douglas is a British construction business based in Reading, Berkshire. The company was originally founded in 1884 as the London and Tilbury Lighterage Company Limited, and retained the Tilbury name until 2001. From 1991 it was known as Tilbury Douglas following a merger with RM Douglas, but in 2001 rebranded as Interserve plc. The name change partly reflected a shift in focus during the 1990s towards maintenance and facilities management services sectors, and this continued in the 2000s, buoyed by further acquisitions.