Sept. 8 (UPI) -- Millions of commuters in Britain were unable to get to work or had their journeys disrupted Monday morning after the London Underground was shuttered by a strike by around 10,000 drivers, signals operators and maintenance crew. National Union of Rail, Maritime and Transport workers walked off the job Sunday through Thursday in a dispute over pay and what they argue are excessive working hours due to staff cuts, closing the mass transit system's eight busiest lines and impacting