Free runners “3run” take advantage of O2's empty Slough HQ on the company's flexible working day on February 8, 2012 in Slough, England. O2 announced the launch of the biggest flexible working initiative of its kind. Today, employees based at the O2 Slough HQ, a quarter of its 12,000 strong workforce will participate in a flexible working pilot, operating remotely for the day as the doors are shut and lights turned off at the business' 200,000 sq ft office. (Photo by Ian Gavan/Getty Images for O2)