 In 2013 Open Europe organised public simulated negotiations over reform of the European Union, and the UK's relationship with it, in a so-called "wargame".The think tank has published several studies on the impact of regulation, including a 2010 study analysing more than 2,000 Impact Assessments.It estimated that in 2009, EU regulation introduced since 1998 cost the UK economy £19.3 billion, accounting for 59% of the total cost of regulation in Britain in that year.