England’s Chris Robshaw ruled out for 12 weeks and will miss Six Nations

• Harlequins flanker will undergo surgery on Monday• England injury problems mount upChris Robshaw has been ruled out of the Six Nations after Harlequins confirmed the England flanker will undergo surgery on his injured shoulder on Monday and will be sidelined for 12 weeks.Robshaw aggravated an existing injury to his left shoulder in Harlequins’ New Year’s Day defeat by Worcester and a meeting with a specialist on Monday confirmed the need for surgery. Robshaw had hoped to play some part in England’s defence of their Six Nations title but will now be out of action until April in what comes as …