We don't normally write much about the other code of rugby here but it was fascinating to see one of Ireland's greatest-ever union players (and good mate of the Johns boys) Brian O'Driscoll sidelined by a doctor on Sunday.

At the time O'Driscoll was told he could not return to the field because he was showing signs of concussion, Ireland was on the way to an historic win over New Zealand. Perhaps if he had returned, they may have held on.

Brian O'Driscoll suffered a concussion during Ireland's narrow loss to the All Blacks. Credit:Getty Images

Now, rugby union has been accused of not doing enough to protect itself against the sort of legal action over concussion that has happened in the US - but it's still doing a helluva lot more than we are with its five-minute pitchside assessment policy.

In our World Cup, players have continued on after being assessed on the field, on the run, or seemingly not assessed at all.