O'Brien: Wales defeat was a lesson

Sean O’Brien believes blowing a Grand Slam in Wales “might not have been the worst thing in the world” as Ireland eye the World Cup after retaining their RBS 6 Nations title.

Leinster flanker O’Brien grabbed two tries as Ireland thumped Scotland 40-10 at Murrayfield to claim back-to-back Six Nations titles for the first time since 1949.