Rounding up a busy Saturday with eight matches in the Champions Cup as Harlequins thump Cardiff and Exeter progress, but Sale and Bristol lose.
Harlequins moved to the top of the Premiership with a bonus-point win over Newcastle, while Bristol ended Sales' long winning home run.
Harlequins prop Joe Marler's arm injury is being assessed by specialists amid front-row concerns for England ahead of the Six Nations.
Northampton mounted a stunning fightback to beat Sale 21-17 and moved to the top of the Gallagher Premiership table with a sixth successive victory.
Bath top the Gallagher Premiership at Christmas after winning an absorbing battle with fellow title contenders Harlequins 25-17 at the Rec.
Sale produced a superb second-half show to open their Champions Cup campaign with a 28-5 victory over Stade Francais at AJ Bell Stadium.
Marcus Smith said it was "quite scary" to see England team-mate Owen Farrell step away from international rugby.
Marcus Smith won the duel between England's fly-halves in waiting but it was the contribution of Harlequins' pack that underpinned a 36-3 win over Sale.
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