Vivienne Westwood and Dragon's Den's Deborah Meaden have joined Boris Johnson's search for green entrepreneurs of the future as judges for the Mayor Of London's 2013 Low Carbon Prize, which challenges London students to come up with innovative ideas for carbon emission reduction in the capital.

Other judges for the £20k prize include Science Museum director Ian Blatchford, architect Sir Terry Farrell and environmentalist Zac Goldsmith MP.