His decision to introduce experienced fly-half Ceri Sweeney as a replacement for the misfiring Gareth Davies was rewarded as the former international grabbed the winning try as the Blues came from behind to end a six-game losing streak.
Dan Fish and Tom James also crossed for the hosts, with Elliot Daly going over for the only Wasps try.
Number eight Morgan Allen's last-gasp try saw a young Ospreys side overcome Gloucester 33-27 in a dramatic encounter at the Liberty Stadium.
The hosts had led 26-13 with eight minutes to go but a Dan Murphy score and a penalty try put the Aviva Premiership side ahead with time running out.
But the Ospreys responded emphatically, driving Allen over the line against some tentative defence to seal an excellent win. Wing Tom Grabham also crossed for the Ospreys, with fly-half Matthew Morgan kicking four penalties and two drop goals, while replacement Sam Davies, son of Gloucester boss Nigel, slotted five points.
aracens opened their campaign with a 38-21 win against a Leicester side whose late second half comeback saw them avoid an embarrassing scoreline.
After taking home games to Brussels, Wembley and Twickenham the nomadic Premiership outfit took this LV= Cup game to Championship side Bedford's ground and a crowd of 3,168 saw them collect five points with tries from Jamie George, Duncan Taylor, Joe Maddock and Andy Saul.
Leicester found themselves 30-0 down shortly after the break before Joe Cain, Michael Noone and Harry Thacker tries gave the Tigers some respectability.