By Melissa Jones Jump racing fell to the freeze – and put all-weather action at Lingfield’s Winter Million Festival in the spotlight. Oh So Grand showed a bright burst of speed to delight BetMGM Winter Oaks Fillies’ Handicap favourite backers. Her wide run and a slow pace failed to hamper the 11-8 market leader, winning with more in hand than the length and a half margin. “Her level of progression is mind-blowing,” said rider Jack Mitchell, his mount’s hat-trick lining up a potential Group race bid. “When I asked her to go she was electric.” Aidan Keeley sneaked up the inner of his idol Ryan M…