And they get their reward as hooker Elliott Dee touches down after a huge forward drive. And Tom Prydie converts from the touchline. It's no more than the Dragons deserve.

Adam Jones is penalised at a scrummage but Dragons go for the corner and not for goal.

Dragons are playing well and Hallam Amos pins the Blues back into the corner with a a low touch-finder. But they need to make their dominance pay.

Jonathan Davies
Former Wales fly-half on Scrum V

"I think the ref has had a block of hair gel for Christmas"

You might be right there, Jiffy. Here's a lovely close-up shot of referee Leighton Hodges...

Image source, BBC Sport

Blues fly-half Gareth Davies misses a penalty from in front of the posts after Nick Cudd is harshly penalised for obstruction. Dragons retain their lead.

It's not a thriller and there's little festive cheer on display as the Blues survive 10 minutes of Dragons pressure without conceding further points. Will the Dragons live to regret that?

Rynard Landman and Adam Jones have a difference of opinion off the ball. The Dragons second row is penalised so the Blues relieve the pressure.

Dragons batter away at the line before spilling the ball within yards of the line.

Ellis Jenkins has to cover back to save the day for the Blues as Tovey again poses questions - putting a neat kick through before the flanker covers across to give away an attacking scrum for the visitors.

And the Wales international nails it with plenty to spare from more than 50 metres.

Tom Prydie steps up for a penalty attempt from the half way line.

Cardiff Blues have a rather Argentinian flavour to their back-line these days with the likes of Joaquin Tuculet and Lucas Amorosino.

Tuculet's orange footwear is rather eye-catching, prompting Michael Heneghan to tweet: "I like this Cardiff full-back, and indeed his boots #ScrumV"

Will it be lucky orange for Blues on Boxing Day?

Image source, Huw Evans picture agency

Dragons building up a head of steam for the first time as fly-half Jason Tovey makes a break to set-up a wave of attacks near the Blues try line. Then Tovey misses with a drop-goal attempt.

It's a sparring match between the two 22 metre areas at the moment. Neither team getting on top. Both teams making errors.

Phil Steele on Scrum V

"Two years ago the old pitch was the consistency of a dodgy meat pie, so it's a huge improvement. And the perceived wisdom is this pitch plays a bit better when it's wet."

Bechan Anwen Rees writes: "It's #boxingday which means its #scrumv time #BluesvDragons

Both sides need a win in the Pro12, but will the points be staying in Cardiff or travelling back down the M4?

We're underway, with the big advantage of the artificial pitch at the Arms Park immediately evident. In spite of the rain, the playing surface is perfect so the players will not be able to blame that if the game is below par.

Jonathan Davies
Former Wales fly-half on Scrum V

"The weather isn't playing its part. It's absolutely chucking it down! Let's hope it doesn't affect the game too much."

Elliott Dee starts at hooker for Dragons in place of T Rhys Thomas who pulled up during the warm-up.