Castleton Technology PLC, formerly Redstone plc is principally engaged in the supply of integrated and converged information technology (IT) communications services. Its Managed Solutions delivers a portfolio of network management and Internet services for businesses and public sector organizations. Solutions and services include security software, server and desktop deployment, application development, hosting and co-location, network and system management, Internet service provision and consultancy. Its operating segments include Annuity business, Project business and Central Costs. The Annuity business consists of campus based managed services, connectivity and cloud services and hardware maintenance; Project business includes consists of cabling, ICT projects, equipment sales and consulting services. In November 2013, it disposed of its ICT Infrastructure, data centre and smart building solutions business, Comunica Holdings Limited to Coms Plc.