Saints book play-off berth with bonus point win against Exiles at Franklin's Gardens.
Saracens cement top spot in the Aviva Premiership with their 18th win of the campaign.
Wasps boost their chances of European rugby next season with victory at Twickenham.
Danny Cipriani dominates as Sharks seal their place in the European Champions Cup next season.
Bath strengthen their Aviva Premiership play-off hopes with a bonus-point victory.
Manu Tuilagi scores two of Tigers' four tries in a closely fought encounter.