Owen Farrell ruled out of England’s Six Nations tournament

• Knee injury to fly-half adds to Lancaster’s woes• Door could open for Danny Cipriani on the bench• Robert Kitson: Farrell injury raises Cipriani questionOwen Farrell has been ruled out of England’s Six Nations tournament after suffering knee damage during Saracens’ 18-6 defeat by Clermont on Sunday.The fly-half had to leave the ground on crutches and, after initially being ruled out of England’s opener against Wales on Friday 6 February, the Rugby Football Union put out a statement saying he had a “high-grade medial ligament strain and will be out for the duration of the Championship”. Conti…