The daughter of Lawman made a promising debut at Newmarket a fortnight ago and stepped up on that to win this valuable event under Andrea Atzeni.
A lot went wrong during the race with Notary racing keen, unable to get cover from her wide draw.
Andrea was forced to make his move with three furlongs to run and she was in front far enough from home. The runner-up Anabel was closing fast but Notary stuck her neck out galliantly to win by a short head.
Roger said: "That was pleasing because a lot went wrong and she has still won. She has plenty of speed and that's as far as she wants to go for now."
In addition to winning the lion's share of the £25,000 win fund, Notary also picked up a £10,000 plus ten bonus for her owners Cheveley Park Stud.