Paul Grant and Anthony Watson both scored two tries each as Todd Blackadder’s men ran in 10 in total at the Rec to seal a home tie in the last eight.

It did not take long for Bath to get on the board – a minute and 25 seconds to be precise – after Tom Dunn powered his way over in the corner.

Pau were on the back foot and it took just four minutes for the hosts to double their lead. George Ford hopped in as temporary scrum-half and found No 8 Grant who crashed over.

It was not Pau’s day as three injury replacements in one minute hampered their progress and when Bath came knocking once again, Ford had to settle for a simple penalty.

Watson found his first and his team's third when he collected Jonathan Joseph’s kick, before Pau climbed their way into Bath territory for the first time 28 minutes in.

Pierre Dupouy, however, spilled on the try-line as Tom Homer intercepted a loose pass to run the length of the field to score at the posts.

At that stage the hosts were running riot, averaging a point a minute after Ford’s conversion.

Giovanni Kueffner was sent to the bin for retaliation, but the visitors got themselves on the board courtesy of a Brandon Fajardo penalty.

Grant bagged his second with ease one minute after the interval, but Ford hit the uprights for the second time with his attempt at the extras.

Bath were well on top and Watson soon had his second after diving over at the posts. Rhys Priestland then gathered his own kick to cross six minutes later for Bath’s seventh.

But Pau had their reward for a slightly improved second-half display when Mosese Ratuvou crossed in the 61st minute.

Homer was on hand to tee up Zach Mercer who raced away for try number eight – matching last week’s tally against Bristol.

Ben Tapuai was on hand to surpass that haul as he slid in for the ninth, with Ross Batty securing the tenth at the death.