The TMO adjudges North's right foot had just slid over the touchline in the act of touching down. Credit to Scotland wing Lee Jones for getting back to force him out.

Image source, Reuters

Gareth Anscombe chips to the right corner and George North appears to dab it down in the right corner. But is that a foot in touch?

Alun Wyn Jones rises to claim the line-out and Wales have a promising attacking situation, but Scotland's defence holds firm and Ali Price clears to touch.

Image source, Getty Images

Plenty of possession for Scotland - 72% so far - but Stuart McInally is pinged for holding on after Wales flanker Dan Lydiate wraps himself all over the Scotland captain. Gareth Anscombe drills the penalty into the corner...

Scotland prop Willem Nel steals the ball on the ground and suddenly Scotland have a break with Alex Dunbar shrugging off opposite number Hadleigh Parkes and running deep into Welsh territory.

Leigh Halfpenny gets back to clear the danger but Scotland still have the ball in Wales' half...

Peter Wright
Former Scotland prop on BBC Radio Scotland

Tom English
BBC Scotland's chief sports writer

Nine defeats in a row for Scotland in Wales with a try count of 31-9 in Wales’ favour. If they are to have any hope of ending that run today they’re going to have to do everything they didn’t do in February. Hold on to the ball, keep their shape in defence, play with urgency, take their chances.

Image source, Reuters

Leigh Halfpenny, one of the most reliable goal-kickers in world rugby, gives Wales the lead with a solid swing of his right boot.

Image source, Reuters

Quiet opening, both teams feeling each other out, trying to go through the phases. Scotland go through seven in their own half before Wales hooker Ken Owens wins a penalty on the floor.

Image source, Reuters

Gareth Griffiths
BBC Sport Wales at Principality Stadium

Strange feeling in the Principality Stadium for an autumn fixture. The pomp and ceremony is the same with the roof closed, the roaring fire and fireworks greeting the two sides. But Wales normally play a southern hemisphere superpower for their fourth Test that falls outside World Rugby's international window. We will see whether the old Six Nations rivals Scotland will create the same atmosphere.

Scotland fly-half Adam Hastings kick off...

The players out on the pitch, we've had Flower of Scotland, and 'Land of My Fathers' is now ringing round the Principality Stadium with moments to go until kick-off.

Matthew Hobbs
BBC Sport reporter at the Principality Stadium

Glasgow fly-half Adam Hastings makes just a third start at fly-half today, and the son of former Scotland captain Gavin looked anything but daunted during the warm up.

Ahead of his first appearance against a Six Nations rival, the 22-year-old was all beaming smiles as he went through a kicking routine on the Principality Stadium pitch, singing along to Tom Jones. Given it's not unusual for Scotland to lose at this venue - they've only won once here since it opened in 1999 - he'll be hoping the smiles continue at the final whistle.

A quick reminder of today's teams before we get under way shortly...

Wales: 15-Halfpenny; 14-Morgan, 13-J Davies, 12-Parkes, 11-North; 10-Anscombe, 9-G Davies; 1-Smith, 2-Owens, 3-Lewis, 4-Hill, 5-Jones, 6-Lydiate, 7-Tipuric, 8-Moriarty.

Replacements:16-Dee, 17-R Evans, 18-Brown, 19-Beard, 20-Wainwright, 21-Williams, 22-J Evans, 23-S Evans.

Scotland:15-Kinghorn; 14-Seymour, 13-H Jones, 12-Dunbar, 11-L Jones; 10-Hastings, 9-Price; 1-Dell, 2-McInally, 3-Nel, 4-Toolis, 5-Gray, 6-Ritchie, 7-Watson, 8-Wilson.

Replacements:16-Brown, 17-Allan, 18-Berghan, 19-Gilchrist, 20-M Fagerson, 21-G Horne, 22-P Horne, 23-Graham.

Image source, Reuters

Doddie Weir has unveiled a cracking new suit for the occasion that combines Scottish and Welsh tartan for his big day in Cardif

"I've got a new suit for today - we've got the pride of Scotland tartan, pride of Wales tartan, we're here for an absolutely fabulous day," he says.

"The whole rugby public has been truly amazing for my foundation and what we're up to.

"I would love this trophy to be taken back to Scotland and to drink out of it! But I'd also be delighted if the Welsh won it so I could drink out of it there as well."

Looking good, big man.

Image source, SNS

Scotland head coach Gregor Townsend says Scotland will have to do "very, very well" to overcome Wales, who thumped them 34-7 in the opening game of this year's Six Nations.

"We let the supporters down here nine months ago," he said. "They've came down in their thousands again which is fantastic.

"We know there is going to be times when we don't get things right and it will cost us, but I believe the way we bounced back after the previous Wales game nine months ago showed what the team are capable of.

"But we'll have to do very, very well to beat this strong Wales team."

Image source, PA

Tom English
BBC Scotland's chief sports writer in Cardiff

Principality Stadium. One of the great sporting arenas on the planet, if not the greatest. Horrible place for Scotland over the years of course. Lost their last nine here and outsiders to end that run this afternoon.

Image source, PA

Scotland also have a relative newcomer at fly-half today in the shape of Adam Hastings. The name may be familiar - his old man Gavin, the Scotland and Lions legend, wasn't a bad player, ditto uncle Scott.

This will be Adam's first start for his country on UK soil, having won his first caps on Scotland's summer tour - a replacement outing against Canada, and starts against USA and Argentina.

Then, as today, Finn Russell was missing, one of the nine exiles unavailable to Gregor Townsend for this opening autumn Test. But the head coach has made clear that he sees the emerging Hastings, 22, as "genuine competition" for the mercurial Racing 92 fly-half.

So today is a big opportunity for the youngster to show the form he displayed against Argentina on tour, and for Glasgow this season.

Another player to watch is Blair Kinghorn, who in the injury-enforced absence of Stuart Hogg, gets the chance to start at full-back for his country for only the second time, having scored a try in each of his three starts on the wing.

Image source, SNS

A couple of new names to look out for today on both sides, especially for those not familiar with the weekly goings-on in Welsh or Scottish rugby.

Wales will have a debutant wing in the shape of Luke Morgan, a former star of the World Sevens Series who is now strutting his stuff in the 15-a-side game with Ospreys.

Morgan scored a remarkable 131 tries for Wales Sevens, so clearly knows his way to the try-line. Can he get off the mark today in the longer form?

Cardiff Blues fly-half Jarrod Evans is another potential debutant off the bench for the hosts, and he could offer a different threat to club-mate Gareth Anscombe, who starts in the number 10 jersey for Wales for only the fourth time today.

Image source, Huw Evans Picture Agency

If you've got a couple of minutes spare while you're at the bar, or on your sofa waiting for kick-off, why not test your knowledge of some of the previous Wales-Scotland matches down the years.

Click on this link, and away you go: bbc.in/2P0PCuh

Image source, Getty Images