Annie Power: unbeaten mare one of the stars on show on ThursdayPICTURE: Alain Barr (racingpost.com/photos)
Annie and Buck's ready for Thursday showdown
Big Buck's, the four-time World Hurdle winner, is one of four runners declared by Paul Nicholls along with last year's second Celestial Halo, Zarkandar and Salubrious.
After rejecting the ride on Big Buck's, Daryl Jacob will instead be aboard Celestial Halo with Nick Scholfield on Salubrious and Noel Fehily on Zarkandar.
Despite worries about his participation on Monday, More Of That has been declared by trainer Jonjo O'Neill - with Barry Geraghty bookled to ride - while Quevega, favourite to win a sixth OLBG Mares' Hurdle on Tuesday, has also been left in the race.
In the Ryanair Chase, leading fancy First Lieutenant has not been declared and is set to head for the Betfred Cheltenham Gold Cup on Friday instead.
His absence could be viewed that owners of Last Instalment, who also own First Lieutenant, are concerned about the ground for the Irish Hennessy winner but trainer Philip Fenton said: "At the moment Last Instalment is running on Friday bar a complete change in ground."
Of the 12 runners remaining in the Ryanair, favourite Al Ferof, Benefficient and Dynaste all feature.
Big fields are the feature of the Neptune Investment Management Novices' Hurdle, Coral Cup, Fred Winter Juvenile Hurdle, RSA Chase and Weatherbys Champion Bumper.
Jason Maguire has been replaced by Richard Johnson on Corrin Wood in the RSA Chase and on Clondaw Kaempfer in the Coral Cup.