UK Stocks-Factors to watch on June 27

June 27 (Reuters) - Britain's FTSE 100 index is seen opening down 160-172 points at the open on Monday, which would mark a percentage drop of 2.6-2.8 percent, according to financial bookmakers. * The UK blue chip index closed 3.2 percent lower at 6,138.69 points on Friday after the country voted to leave the European Union, having initially fallen more than 8 percent. * BREXIT: The $2.08 trillion wiped off global equity markets on Friday was the biggest daily loss ever, trumping th