Mark Webber and Brendon Hartley during Thursday set up for the FIA WEC 6 Hours of Silverstone held at Silverstone Circuit, Northamptonshire, England from 10th to the 12th of April 2015 during Thursday set up for the FIA WEC 6 Hours of Silverstone held at Silverstone Circuit, Northamptonshire, England from 10th to the 12th of April 2015