Aviva Premiership game zone: Northampton v Wasps and Worcester v London Irish Northampton v Wasps Franklin's Gardens, 7.45pm, ESPN Northampton have recalled Tom Wood at openside in place of Phil Dowson as they attempt to defend their unbeaten record. Dominic Waldouck returns at centre in place of George Pisi in the other change to the side that beat Worcester. South Africa No 8 Ashley Johnson is unavailable for Wasps for family reasons and Stephen Jones has to settle for a place on the bench having missed training because of illness. Former Gloucester wing James Bailey makes his debut and Tom Lindsay, Joe Launchbury, Nick Robinson, and Andrea Masi start. Former England prop Tim Payne will make his 250th appearance for Wasps. Worcester v London Irish Sixways, 8pm Worcester are missing former England scrum-half Shaun Perry (knee) so Jonny Arr deputises. Josh Matavesi, who scored a try as a replacement at Northampton, is preferred to Joe Carlislein the centre and Matt Kvesic replaces Semisi Taulava at No 8. London Irish welcome back hooker David Paice from a suspension carried over from last season. Scotland international Scott Lawson makes way with Sailosi Tagicakibau replacing Topsy Ojo on the left wing.