By Press Association Dual Coral Cup winner Langer Dan takes a step into the unknown as he tackles Grade One company for the first time in the William Hill Aintree Hurdle. The eight-year-old had struggled for form during the winter but trainer Dan Skelton reported the gelding had suffered from stomach ulcers over that period. He was right back to his very best at Cheltenham, however, winning by three and a half lengths to become the first dual winner of the ultra-competitive handicap and he now faces top-level scorers Bob Olinger and Impaire Et Passe in a field of eight. “He’s up in class, runn…