December deal for British EU reform difficult - chief EU negotiator

By Conor Humphries and Padraic Halpin DUBLIN (Reuters) - It will be difficult but not impossible for officials renegotiating Britain's EU membership to have a framework ready for substantial discussion at next month's European Union summit, the EU's chief negotiator said on Wednesday. Prime Minister David Cameron is trying to win concessions from other leaders ahead of a referendum on British membership promised by the end of 2017 amid opinion polls that show British perceptions of the EU are ch