Replacement (from): D Fogarty, J Brugnaut, R O'Mahony, S Archer, F Jones, S Deasy, P Stringer, E Grace, M O'Driscoll
Replacements from: C Dermody; J Buckland; A Perry, N Kennedy; P Hodgson; J Lennard; D Danaher; J Fisher; G Stowers; J Joseph; A Lalanne; M Watson
However, not for the first time on a balmy evening, Munster showed tremendous resilience and it was Warwick who settled the nerves with a superb long range penalty in the 78th minute.
Afterwards coach Tony McGahan expressed his satisfaction with the performance. "Yes, very happy with that," he said. " Tonight was a step up and a great result. The young lads were tremendous again tonight. Our defence was good. We mixed in a few of the older boys and good to have them back too. But the squad have been working well and that work has shown. So all in all very happy with the performance."
London Irish quickly ate into the Munster lead after the break with try from Sailosi Tagicakibau converted by Lamb who had earlier added a penalty.
But then the large crowd were treated to a superb try when Danny Barnes scored on the right after superb hands from Tom Gleeson and replacement Scott Deasy. Warwick converted but a Jamie Leonard drop goal and Lamb's conversion of George Stowers try in the 73rd minute set up a nervy finish.
But it was Munster - reinforced with the second half arrival of Mick O'Driscoll, Peter Stringer, Denis Fogarty and Felix Jones- who held their nerve best to emerge worthy winners.