A sharp-eyed IG member spotted Anna Pavord's advice in Weekend Work, the Independent Magazine, on 15 November 2008, recommending the following sources of information: Dusty Gedge's Practical Beginners' Guide to Installing Green Roofs, which can be downloaded for £11.65 from www.grassrootscompany.co.uk or www.livingroofs.org. There is also N. Dunnett and N. Kingsbury, Planting Green Roofs and Living Walls, Timber Press, £25.