The Queen was "given a welcome reason to smile" as Kincardine crossed the line.
The 20/1 shot won for the pairing of Tom Lacey and Stan Sheppard on a thrilling day of racing in Berkshire.
Funambule Sivola finished two-lengths clear of Sceau Royal in the Game Spirit at Newbury
The eight-year-old finished two-and-a-quarter lengths ahead of Royal Pagaille, while race favourite Clan Des Obeaux had to settle for third.
The seven-year-old extended his unbeaten record over fences to land the Betfair Cheltenham Roarcast Novices’ Limited Handicap Chase.
A total of 14 horse have been declared for Britain’s richest handicap hurdle, with Broomfield Burg and First Street representing the Henderson team.
Clan Des Obeaux, Bravemansgame and Hitman will all run on Betfair Super Saturday this weekend.
The seven-year-old finished second to Constitution Hill in the Tolworth Hurdle at Sandown.
The superstars will be making their first appearance since they retired on Betfair Super Saturday.
Tritonic and Onemorefortheroad to rematch at Newbury in Europe’s richest handicap hurdle
Following on from Bravemansgame last year it was Paul Nicholls and Harry Cobden who teamed up again.
The 24-year-old recorded the biggest victory of his career on Iwilldoit in the Welsh Grand National.
The Grade 1 race takes place at Newbury Racecourse on December 29.
Newbury Racecourse prepare to host their final race meeting of the year on December 29.
The Seven Barrows handler is expected to bring a strong team to the Ladbrokes Christmas Festival.