Saracens' Billy Vunipola tries to find a gap between Munster's Peter O'Mahony (c) and Munster's BJ Botha (L) - Munster's James Cronin is on the floor Saracens v Munster - 17/01/2015 - European Rugby Champions Cup - Allianz Park - Hendon - London - UK Credit: Andrew Fosker / Seconds Left Images