http://solutionsfortheplanet.co.uk
Solutions for the Planet is a social enterprise, working with schools, communities and businesses to promote education for sustainable development, social enterprise, and science, technology, engineering and maths (STEM) careers.
It runs dynamic education programmes, working with secondary schools and businesses primarily (but not exclusively) in the utility, energy, manufacturing and construction sectors.
If you are a school who has used them, please comment below.