Mike Haley of Munster is tackled during the United Rugby Championship match between Scarlets and Munster at Parc Y Scarlets in Llanelli, Wales. Photo by Gareth Everett/Sportsfile

Mike Haley of Munster is tackled during the United Rugby Championship match between Scarlets and Munster at Parc Y Scarlets in Llanelli, Wales. Photo by Gareth Everett/Sportsfile

Buckle up, another marathon rugby season is upon us. This weekend saw the start of the URC coincide with the beginning of the English Premiership, or PREM Rugby as it has been rebranded by the cool kids down the back. And while the French Top 14 is already four games into its own mammoth campaign, all roads lead to the same finishing point next July.

With so much road to run between now and then, here are some of the biggest storylines to watch out for.