Judging was based on each company's progress in improving its environmental, social and financial performance, and there were more than 100 entries in the company's category.

Focus areas included strategy on waste, transport, energy, carbon emissions, buildings and pollution control.

Jim Dinnage, chairman of Oxford-based Seacourt, said: "The Sustainability Live event and publication have grown over the years to become outstanding platforms of communication in our industry and so we are bowled over to have won this prestigious award. 

"However, the greatest recognition and thanks need to go to our loyal and supportive customers – many who have been with us from the start of our sustainable journey."

The Sustainability Live event is part of the Environment and Energy Awards and is sponsored by WRAP, BSi and AEA.