Scrum V Live Pro12: Blues v Scarlets
In round 10 of the Pro 12, the Blues welcome the Scarlets to the Arms Park for the first of the Christmas derbies.
The studio guest is Martyn Williams, while Sean Holley provides the analysis and Jonathan Davies is in the commentary box with Gareth Charles.
This is a live BBC Sport stream starting at 19:30 GMT.
Available to UK users only.