Quins and Bath among winners
Harlequins regained top spot in the Premiership with a victory over Leicester, while Bath won their sixth game in a row and Saracens also won.
England scrum-half Danny Care produced a moment of magic as Harlequins edged a thrilling contest 25-21 against Leicester at The Stoop.
Trailing at the break, Care ran half the length of the field from a tap penalty to reignite Quins, with the mercurial Ben Botica adding 20 points from the boot in an impressive kicking performance as Leicester crumbled.
Toby Flood scored 16 points for the Tigers on his return to Premiership action while Adam Thompstone touched down, but it was not enough.
Meanwhile, Bath made it six wins from as many games in all competitions with a bonus point 40-16 victory against London Irish.
Looking a far more fluent outfit than the side that stuttered through the first half of the season, they saw off the Irish challenge with two tries in the last five minutes, the last coming in the final play of the game from prop Anthony Perenise.
Replacement fly-half Tom Heathcote converted all four tries and also kicked two penalties.
The other Bath scores were a Donald penalty, a penalty try and touchdowns by Nick Abendanon and Nathan Catt.
It was quite a comedown for the Exiles after their victory over Saracens last weekend but they were undermined by a penalty count of 18-5 - and three yellow cards.
The only bright moment was a thrilling breakaway try by replacement scrum-half Jack Moates but the defeat leaves them back in the relegation dogfight.
Saracens celebrated their Premiership debut at Allianz Park by demolishing Exeter 31-11 with a rare four-try victory.
Before this latest game the 2011 champions had run in only 14 tries in as many games - the lowest number in the league - but Saracens celebrated their Aviva Premiership debut at Allianz Park by demolishing Exeter 31-11 with a rare four-try victory.
Before this latest game the 2011 champions had run in only 14 tries in as many games - the lowest number in the league - but Mako Vunipola crossed twice and Charlie Hodgson and Matt Stevens also touched down in a bonus-point win.
It was a ringing endorsement for the artificial pitch at Saracens' new £24million ground in Barnet, which was staging its second match but the first in front of a capacity 10,000 crowd.
The only potential cloud hanging over the £500,000 surface designed specifically for rugby union was the terrible place kicking displays produced by fly-halves Hodgson and Gareth Steenson.
Between them they missed six shots at goal and 18 points before the interval, although normal service resumed for Hodgson in the second half when his sights had been readjusted.
Northampton revived their push for the play-offs despite seeing England forwards Dylan Hartley and Courtney Lawes both sin-binned at Sixways as they beat Worcester 27-18.
Flanker Samu Manoa's 70th-minute try - he was driven over the line by his fellow forwards just seconds after Worcester's former Northampton flanker Neil Best received a yellow card - made the difference before referee Greg Garner awarded Saints a late penalty try.
Hooker Hartley and lock Lawes were punished for killing the ball and a late challenge, respectively, yet Northampton had enough in the tank to prevail.
Northampton fly-half Stephen Myler kicked five penalties and a conversion for a 17-point haul, while his opposite Andy Goode landed six penalties out of seven, but it was not enough to stave off Warriors' fourth successive Premiership defeat.