Cameron pleads for 'real progress' in EU talks

By Elizabeth Piper and Robin Emmott BRUSSELS (Reuters) - Prime Minister David Cameron took the floor at a European Union summit on Thursday to try to persuade fellow leaders to give Britain improved membership terms, including disputed relief from immigration, before it votes on staying in the bloc. EU officials said Cameron began his pitch after European Council President Donald Tusk told the summit there was good progress on three of London's four key demands, but the fourth - to deny EU migra