Saracens missed out on the chance to book a Champions Cup round of 16 home tie as Castres produced a stunning victory in London.
Ollie Lawrence has apologised for his role in an incident that led to his England team-mate Alex Mitchell being sin-binned in Bath's defeat at Northampton.
Fin Smith knocked over a last-minute penalty as Northampton beat league leaders Bath 35-34 in a pulsating game of nine tries.
Bath inflicted a record Gallagher Premiership defeat on 14-man Saracens as they powered to a 68-10 victory at the Recreation Ground.
Saracens climbed up to third place after a comfortable victory over Northampton in the Gallagher Premiership.
Northampton overcame the loss of injured captain George Furbank to post a statement 30-21 Investec Champions Cup win against the Bulls in Pretoria.
A round-up of Saturday's Investec Champions Cup action, where Northampton and Saracens made winning starts but Exeter were beaten by Sharks in South Africa.
Defending champions Northampton suffered a shock defeat to Gloucester, while Bath returned to top of the Premiership and Sale beat Leicester.
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