Work will start in December 2016 to provide a wide range of hard and soft facilities management services, including asset surveys and planning, planned and reactive maintenance, cleaning, security and catering for Centrica’s 115 locations in the UK and Republic of Ireland.

The contract also covers delivery of certain construction projects for Centrica.

Carillion’s Chief Executive, Richard Howson, said: “We have worked closely with Centrica since 2005 and built a strong partnership.

“We are delighted to be extending this relationship, which is based on a one-team approach in which Carillion and Centrica work together to deliver award-winning standards of facilities management and customer service across all Centrica and British Gas sites.”