Dr John Douglas, formerly of South Bank University, London. Dr Janusz Gasiorek, formerly of South Bank University, London where he led the Fluid Mechanics group in Mechanical Engineering, with specialist research interest in rotodynamic machinery and fan engineering. Professor John Swaffield   , Emeritus Professor, Heriot–Watt University, has taught fluid mechanics for over 30 years with specialist research in pressure transients, free surface unsteady flows and water conservation. Dr Lynne Jack, Heriot-Watt University, Reader in energy systems and associated environmental impacts, with research interests in unsteady flow modelling and the implications for the built environment of climate change.