European Champions Cup: pool-by-pool guide to the opening weekend

Holders Saracens begin their defence at Northampton in Pool Two while Leigh Halfpenny makes a rapid return to Toulon in Pool Five with his new club ScarletsMike Brown has handed England a boost by returning to the Harlequins starting XV following an ankle injury to face Champions Cup newcomers La Rochelle. Harlequins are further bolstered by the return of their captain, James Horwill, to the second row while Will Collier is fit to take his place at tighthead prop after sustaining a back injury i