Image source, Huw Evans Picture Agency

It was the Scarlets fans that were celebrating with their players as Wham's 'Last Christmas' boomed out over the PA system.

Cardiff will wonder how they didn't make all their pressure count but it was evergreen Gareth Davies who was the hero here once again.

Scarlets had a poor first block of the season but now will eye derby delight against Ospreys and Dragons to keep climbing the table.

Cardiff will lick their wounds before taking on Dragons in the capital and then travelling to Brewery Field to face Ospreys as they try to get their play-off bid back on track.

Join us tomorrow for live coverage of Ospreys versus Munster in Bridgend and then Dragons against Connacht at Rodney Parade.

If those fixtures rival this derby for drama then we are in for a treat.

Image source, Rex Features

Scarlets back row Josh Macleod speaking to BBC Two Wales: "I think we've been building something. Defensively we'll always back ourselves, we've got a great system and great players.

"Absolute credit to the whole team, but there's a long way to go and we'll continue building."

Image source, Rex Features

Player of the match Gareth Davies speaking to BBC Two Wales: "I enjoy a couple of tries at the Arms Park, I enjoy playing there.

"It was a good game of rugby, Cardiff threw everything at us and we weathered the storm. I thought we played well in the second half and deserved the win.

"Peely [Scarlets coach Dwayne Peel] spoke at half-time that we'd get awarded for our defensive effort in the first half, and we saw it out in the end.

"Nobody thought we were going to come here and win, so we're happy with that."

Richie Rees
Former Wales international on Scrum V Live

Cardiff will rue that one. All the numbers were in their favour, but it's all down to Gareth Davies for the Scarlets.

Scarlets climb above Dragons, who host Connacht, at the bottom of the URC.

Cardiff suffer disappointment and will need to respond on 26 December when hosting Dragons here. They certainly can't be as wasteful in attack.

Scarlets can build on this when taking on Ospreys after Christmas - they are climbing the table after a tough start.

Cardiff had 65% possession and 74% territory but couldn't crack Scarlets' defence.

The visitors racked up 192 tackles to Cardiff's 110.

Scarlets' spirit in the 22 proved to be crucial.

Scarlets extend their remarkable record at the Arms Park - Cardiff haven't beaten them here since 2019.

That was a victory based on gutsy defence and it's disappointment for the play-off chasing Blue and Blacks, who would have gone top with victory.

Ellis Jenkins
Former Wales flanker on BBC Two Wales

Gareth Davies was easily man of the match. He turned the game on it's head and proved what a big-game player he is.

Cardiff with a breathless attack and the clock hits 80.

They keep attacking against superb Scarlets defence, which puts Cardiff outside the 22.

Cardiff lose their steam and need some impetus.It comes with a Mason Grady charge into the 22 but then Callum Sheedy bizarrely kicks to the left. It's slapped down and hacked into touch by Gareth Davies.

Scarlets have done it. They are the first side to beat Cardiff at the Arms Park this season.

A ball is slapped back from an aerial bomb and caught by Cardiff hooker Evan Lloyd.

However, the ball was close to the injured Blair Murray so referee Ben Breakspear blows up.

Play will restart with a scrum after Murray is helped from the field with an injury to his left ankle. That's a blow for Scarlets - and potentially Wales ahead of the Six Nations.

Gareth Davies kicks the ball dead and Cardiff have a line-out just in the Scarlets' half, can they conjure something?

They have struck late plenty of times this season and need another special play.

James Hook
Former Wales fly-half on BBC Two Wales

Scarlets have been outstanding at the breakdown tonight. Cardiff look lost of ideas when they get into the 22.

Scarlets, who are back to 15 men, defend strongly yet again to win a penalty.

They clear their lines and amble to the line-out. They have eight minutes to complete a remarkable backs-to-the-wall victory.

Upping the sneaky factor, Gareth Davies picks off a pass to restore Scarlets' lead with his second score of the night.

Yet another penalty against the Scarlets - a high tackle on Ben Thomas - allows Cardiff to kick into the 22.

A crowd of 11,728 is going to get a dramatic finish.

Then almost immediately Josh Adams replied for Cardiff after Callum Sheedy's clever kick through.

Here's that first Gareth Davies try as the Scarlets scrum-half tippy-toes down the blind side.

Error follows error with knock-ons by Marnus van der Merwe and then Johan Mulder from a Taulupe Faletau offload after he carried from a rapidly retreating scrum.

It's nervy out in the middle and in the stands.

Next score is huge.

Scarlets replacement Marnus van der Merwe is introduced for Wales hooker Ryan Elias and the Springbok is able to celebrate a scrum penalty with his first act.

Scarlets suddenly counting down the minutes, both of the yellow card and to full time.

Ellis Jenkins
Former Wales flanker on BBC Two Wales

I think that's a penalty try. Johnny Williams is coming from an offside position, he's had the ball passed into him, I think that's a try under the posts if he's not there.