Justin Bere presented a lecture at Ecobuild 2008 on Passivhaus technology, which is now recognized by the RIBA as the emerging European standard for low energy design. The lecture was titled “Keep it Simple Stupid” (KISS) and explained how 15 years of Passivhaus research in Europe has resulted in proven design techniques that are clear and simple to understand and to verify for both designer and contractor. Justin argued that the clarity and authenticity of this ‘no nonsense’ approach is the essential next stage in UK sustainable design. The Passivhaus design approach overcomes the widespread confusion, failing targets, false rhetoric and ‘greenwash’ that presently plagues the UK low energy scene.