The daughter of Tamayuz has won at Wolverhampton and Yarmouth already this season and put up another incredibly game display to win under James Doyle.
Again she made the running with James getting her into a good rhythm at the head of affairs.
The Mark Johnston-trained Bureau briefly hit the front but Thurayaat battled back gamely against the rail to win by a neck.
Roger said: "I thought she was beat at the furlong pole but she battled back. She tries very hard and looks as though a mile and half would be within her compass."