https://www.carbontrust.com/resources/green-business-directory/

We partner with businesses, organisations and governments around the world to help them lead the way to a more sustainable future. From setting the strategic direction, footprinting and target setting, to energy systems and climate action plans, our independent experts will help you navigate the risks and opportunities of climate change. Carbon Trust Accredited Suppliers listed in our Directory have been independently assessed by the Carbon Trust and met or exceeded criteria designed to examine their capability and proven track record of delivering thoughtful, well-designed energy efficient and renewable energy systems.