Billy Vunipola set to miss England’s Six Nations campaign after arm break

• England No 8 fractured forearm playing for Saracens v Ospreys• James Haskell faces suspension after Jamie Roberts tackleEngland have been dealt a hammer blow before the defence of their Six Nations title after it was confirmed that Billy Vunipola has suffered a fractured forearm in yet another injury setback for the No 8.Vunipola will see a specialist this week to determine a time frame for his return but he is almost certainly out of England’s Six Nations opener on 4 February in Italy and his participation at any stage of the tournament is now in serious doubt. Related: Saracens’ title defe…