Just over 11 minutes to go and the crowd of 15,632 is making a good din. It's a tense one.

Scarlets have had 58% of possession since the break. Great comeback after a rough first half.

Steven Shingler nails the kick - just two points in it with 15 minutes to go.

Ian has emailed from across Europe: "Season's greetings from me here in Germany. You are real diehards. I'm amazed they're playing at all in that weather."

Image source, Owen Rawlings

True festive Welsh weather! Even Ospreys' mascot is feeling a little chilly...

Any other rugby fans following the game from abroad?

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Moldovan Dimitri Arhip kicks the ball on and when it's sent back with interest Rhys Webb gets in Dan Evans' way and the full-back knocks on. Attacking scrum for Scarlets on the Ospreys' 22.

Image source, Huw Evans picture agency

Twenty minutes to go and the Scarlets are stopping the Ospreys playing - winning a penalty even after Alun Wyn Jones robs their lineout throw-in.

Nick Webb
BBC Radio Wales commentator

"The Scarlets need to keep as much of the ball in the scrum as possible - that's the one area where they have the upper hand."

Scrummage pummels Ospreys again. Penalty chance for Steven Shingler who chips it over.

This is not as clear-cut as the Pro 12 table suggests it should be. Scarlets have made an impressive start to the second half and the scrum is a real weapon for them now as they turn over an Ospreys put-in to gain an attacking platform.

Rebecca Williams tweets: "Referee has absolutely no clue at the scrum. Samson [Lee] is pummelling them #Scarlets

Cerith Evans says: "Rhys Webb and Dan Biggar are on fire #cmonOSPREYS"

Andrew Priestley writes: "Scarlets are a great attacking side, if only they could learn how to defend consistently well. It's the only thing holding them back #ScrumV"

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The Scarlets are warming to their task here, with their scrum posing all sorts of problems for the Ospreys.

Liam Williams is showing why some in Wales think he should be starting at full-back for the national team with Leigh Halfpenny moving back to the wing. Super tackle on Natoga resulting in a turnover penalty for the Scarlets.

As you'll gather from the TMO discussion here, it's a low key start to the second period.

Of course Derek Bevan - today's TMO - has a pretty impressive CV. He refereed the 1991 World Cup final between England and Australia.

We've had five minutes of the second half and no TMO discussion yet!

Gareth John Bale (not the Real Madrid man by the way) has tweeted his summary of the first half: "Kick off. Bit of rugby. TMO. TMO. TMO. Cup of tea. TMO. Kick. TMO. TMO. Bit of rugby. TMO".

That's about right, I'd say.

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Biggar is going for goal from the half way line after a Scarlets scrum is penalised.

Image source, Huw Evans picture agency

But he doesn't have the distance as the kick falls well short.

So it wasn't Dimitri Arhip under that pile of bodies - it was Wales international Dan Lydiate marking his debut with a try for the Ospreys.

Image source, Owen Rawlings

Don't panic Scarlets fans - it's still only 17-9!

The teams are coming back out for the second half. Will Ospreys be back on top of the table tonight or will the Scarlets cause a shock.