Card count worries Warburton
Warburton will lead his team against Scotland tomorrow without lock Bradley Davies, who is serving a seven-week ban after being yellow-carded and cited for foul play at the Aviva Stadium.
There was also an incident at Twickenham two years ago when Alun-Wyn Jones headed to the sin-bin for a trip on Dylan Hartley and England scored 17 points in his absence on their way to a 30-17 victory.