A catch and drive saw flanker Redford Pennycook touch down for a try, which fly half Tommy Hayes was unable to convert.
Tongan international flanker Johnny Tuamoheloa is now at Worcester and fly half Dave Harvey has returned to Australia after a spell with Coventry.
The fly half added the two extra points from in front of the posts to make the score 24-10.
Wasps scored four tries, three of them coming from John Rudd, the other from fly half Mark Van Gisbergen.
