Wales’ Jamie Roberts has done Rugby World Cup homework and ready to go

The Wales centre has begun to understand that, as he gets older, he must appreciate the big occasions moreIt could have been even worse for Wales. Losing Leigh Halfpenny and Rhys Webb to injuries they picked up during last Saturday’s final warm-up match against Italy was costly enough but the previous week in Dublin two of their talismans, Jamie Roberts and Alun Wyn Jones, had been taken off less than 48 hours before announcement of the World Cup squad.Initial reports said they would be out for long but, as Warren Gatland said in the after-match conference, you never can tell. “I went up for a…