Action from stage four of the Grand Tour race, featuring a hilly 171.5km route from Dunkirk to Calais. It could be a stage for the breakaway with six category four climbs potentially thwarting the peloton's chase. Gary Imlach presents, analysis from Chris Boardman and Peter Kennaugh, reports from Daniel Friebe and Matthew Rendell, and commentary by Ned Boulting and David Millar.