 In 1977 the then regional North Thames headquarters was relocated to London Road, Staines-upon-Thames, where the overall control room for the pipe network was located, with sub-control rooms located in Slough and Romford.The nine storey headquarters building, North Thames House, had originally been built for Ready Mixed Concrete for their headquarters but the company had been hit by the recession of the mid-1970s and sold the building.It has since been demolished.