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Nick Cullen, who writes the Insulation and Energy theme on pages 29-37, is a partner at London-based Hoare Lea Consulting Engineers

Hattie Hartman, who discusses the AJ's Green Roofs conference on pages 42-43, is a former practising architect and technical editor of The Architects' Journal

Ben Morris, who photographed Amanda Levete for the Designer Profile on pages 25-27, is a London-based fashion photographer who works extensively in Paris

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