Costain Group PLC has been awarded a contract with Thames Water to support the design of a new reservoir in Oxfordshire, known as SESRO (South East Strategic Reservoir Option). This new 150Mm3 reservoir aims to provide a resilient water supply for Thames Water customers in London and the Thames Valley, as well as customers served by Affinity Water and Southern Water. Additionally, the reservoir will create new habitats, increase biodiversity, and provide new leisure and recreation facilities. This project is expected to secure the water supply for 15 million people across the South East. For more details, the full news release can be accessed on Costain's website.