Northampton will play either Bath or Saracens in the last eight, and they will know who they face at about 17:00 BST tomorrow.

Anyway, that was a lot of fun and the rest of the last 16 ties will have a lot to live up to. Take a look at Steve Mather's match report.

We'll have live text and radio coverage on tomorrow's games so please join us!

Quite a weekend coming up. You didn't have any other plans, did you?

Friday

• Northampton 49-41 Castres

Saturday

• Bath v Saracens (15:00)
• Toulon v Stormers (15:00)
• Glasgow v Bulls (17:30)
• Toulouse v Bristol (17:30)
• Harlequins v Sale (20:00)

Sunday

• Bordeaux-Begles v Leicester (15:00)
• Leinster v Edinburgh (17:30)

Image source, Getty Images

Northampton Saints director of rugby Phil Dowson, speaking to Premier Sports: "The maturity of this squad is we can start poorly and then get ourselves back into the game so I was very pleased how we recovered.

"We never thought we were on top of them, we never got away from them in the scoreline, never really managed to deal with the restarts. I never felt the yellow cards were an opportunity, and they played with 14 very well.

"Credit to Castres, we want to play fast and so do they so you get a very open game.

"There are huge elements of our game we want to get better, elements of our set piece have to be better. We will get to work on that on Monday."

Northampton winger Tommy Freeman, speaking to Premier Sports:

"We definitely could have moved a bit better in that second half. We know our attack can go well when we're firing but our defence has really got to step up if we want to keep going forward in this competition and keep these other teams out."

Centre Fraser Dingwall on the quarter-finals: "We'd always prefer to be back at home of course [Saints will play at home if Saracens beat Bath] but it will be an exciting game whoever it is. It's kind of cool that it'll be an all-English affair."

Image source, AFP via Getty Images

Image source, Getty Images

Northampton Saints full-back George Furbank, speaking to Premier Sports:

"We seemed to put some good things on them and then coughed up the ball and they capitalised on it. They're a dangerous side. But it's good to get a win at home again.

"We feel like we've got the team and the coaching staff to go all the way and I don't think we were a million miles off last year. A few injuries and things didn't go our way in that final.

"We'll watch Bath and Saracens and see where we are next week."

Saints' one and only European Cup triumph, in 2000, saw them win 9-8 with all their points coming from the boot of one Paul Grayson.

The chances of that kind of a scoreboard look somewhere between slim and none on current evidence.

There are a few more smiles in the Northampton squad now after they have a huddle/debrief. Castres are taking some deserved acclaim as well.

Paul Grayson
Ex-Northampton and England fly-half on BBC Radio 5 Sports Extra

They rode their luck at times but their ability with ball in hand, to create space, manipulate it and then finish, is second to none in England.

A brilliant home win and a great start to the weekend. Sit back and relax and watch everybody else scrap it out, knowing you've got yourselves in that last eight.

It was a game effort from Castres, they definitely came here to win and Northampton bested them to send the crowd home happy.

Huge respect between the two sides, and rightly so. Northampton are worthy winners but they have had to give everything, and there are a few Saints players having some intense conversations amongst themselves.

I wonder if this might have taken a lot out of them with the last eight looming?

Paul Grayson
Ex-Northampton and England fly-half on BBC Radio 5 Sports Extra

The fans have been treated to a feast tonight. Castres made everyone very nervous with their physical threat and their ability to put genuine pace into the game, they've tested Northampton, but the crowd trust their team - they've been playing like this for a while.

Image source, Getty Images

Castres are back down by the Saints try line in the dying seconds, but they cannot keep hold of it and the whistle goes, meaning that Northampton have a memorable win.

It's another messy lineout, and Castres kick clear but Northampton start to edge downfield again. Going over 50 points would make a statement.

Castres are still piling in despite being down to 14 players, but more recklessness on halfway gives Saints a penalty that they kick to the corner.

My prediction about possible late kicking drama came to naught, but that's fine because this has been an thrilling half of rugby.

Veresa Ramototabua goes to the bin with just over 10 minutes to go, so Castres will be down to 14 for the rest of the match by the looks of it.

James Burridge
Commentator on BBC Radio 5 Sports Extra

The extra two points added and it's game on again.

Listen to radio commentary of the final 12 minutes by clicking "Listen live" at the top of this page.

Veresa Ramototabua goes in hard clearing out Archie McParland, who looks groggy.

Head contact for certain - deliberate?