UK Stocks-Factors to watch on Sept 20

Britain's FTSE 100 index is seen opening 30 points lower at 7,327 on Friday, according to financial bookmakers. * SHELL: Pakistan has approved the construction of five liquefied natural gas (LNG) terminals by groups that include Exxon Mobil Corp and Royal Dutch Shell, aiming to triple imports and ease the country's chronic gas shortage, Pakistan's oil minister said on Friday. * BAE Systems has been awarded a $495 million U.S. defense contract for receiver/pro