"The UK will continue to have membership until 2015 but May has decided not to commit to rejoining after this date when Europol will be given greater powers. The decision has been made despite behind the scenes pressure being applied by the Association of Chief Police Officers (Acpo) and Europol's British director, Rob Wainwright, in favour of membership. The Observer understands that Acpo wrote to May last month to ask her to reconsider her decision before the planned announcement." (Quoted from article)