 Of the waste created by the demolition of Athlone, Cameron and Williamson, 98 per cent was recycled.All five of these new halls were named after former principals and have been designed to be environmentally friendly, accomplished by sedum-planted roofs that change colour by season, as well as being designed to improve insulation.In a BREEAM environmental performance assessment, the Butler, Tuke and Williamson halls were rated "Very Good", as their construction was designed to reduce heat loss.