Factbox: When is a Brexit vote not a Brexit vote? March 29

Britain's parliament will hold a special sitting on Friday to discuss and vote on Brexit, potentially unlocking a delay to May 22 to the country's exit from the European Union but falling short of the criteria needed to formally ratify the deal.The government hopes to avoid another heavy defeat on the deal by separating the two elements which make up the exit package: a legal Withdrawal Agreement covering the terms of the split and a Political Declaration on a long-term relationship.On Friday, t