DARREN HALPIN Associate Professor in the Department of Political Science at Aarhus University, Denmark. He was formerly Professor of Public Policy at the Robert Gordon University, Aberdeen, UK, where he is now Visiting Professor at the Institute for Management, Governance and Society. GRANT JORDAN Emeritus Professor, Department of Politics and International Relations, Aberdeen University, Scotland, UK. He first wrote about interest groups while working with Jeremy Richardson in the 1970s. They completed Governing Under Pressure in 1979 and Government and Pressure Groups in Britain in 1987. He has completed two major ESRC supported surveys into membership issues with William Maloney, which… were reported in The Protest Business (1997) and Democracy and Interest Groups (2007). His other relevant works include Engineers and Professional Self Regulation (1992) and Shell, Greenpeace and Brent Spar (2001).