Refs named for New Year clashes

The major Anglo-French confrontations in Round 5 will see Nigel Owens of Wales take charge of unbeaten ASM Clermont Auvergne v Exeter Chiefs, with Ireland's George Clancy in the middle for Northampton Saints v Castres Olympique in Pool 4. Alain Rolland, meanwhile, will referee the Pool 1 clash of Racing Metro 92 and Saracens at Stade de la Beaujoire in Nantes.