The FTSE 100 fell 1.5% on Friday, ending a two-session advance as investors assessed central-bank policy signals and lower oil prices. Banks led the decline, with HSBC down more than 1.5% and Barclays and Lloyds Banking Group each losing around 2.5%. Energy, consumer and industrial shares also fell, while mining stocks weakened sharply, led by a 4% drop in Glencore. The Bank of England held interest rates unchanged on Thursday but warned that a prolonged Middle East conflict could require tighter policy. The Federal Reserve and Bank of Japan raised rates this week and indicated further tightening could follow. UK retail sales increased 0.5% in August, exceeding expectations for a 0.2% decline, while the index was little changed for the week.