Alfred McAlpine plc, a support services company, through its subsidiaries, engages in the development, finance, design, build, management, and maintenance of buildings and infrastructure for individuals and organizations in the United Kingdom. It operates in three segments: Business Services, Project Services, and Infrastructure Services. The Business Services segment provides facilities management services. The Project Services segment provides building and civil engineering services to local and national government, commercial developers, and to the health, education, and leisure sectors. It also manages the development, financing, construction, and maintenance of long term assets. The Infrastructure Services segment provides maintenance and renewal services to the utilities and highways maintenance sectors. Alfred McAlpine is headquartered in London, the United Kingdom. As of February 12, 2008, Alfred McAlpine plc operates as a subsidiary of Carillion plc (LSE: CLLN).