Fabricate took a step up in class in his stride to win the Bet & Watch At sunbets.co.uk Winter Hill Stakes at Windsor.
Michael Bell's horse was awarded a Goodwood handicap in the stewards' room on his previous start, but there was no doubt about this result as he took over three furlongs from home before seeing off the challenge of Spark Plug (7/2).
Chain Of Daisies took third having set a generous gallop in the Group Three, with Mark Johnston's Frankuus failing to fire as Best Of Days stayed on into an eye-catching fourth.
Winning rider Gerald Mosse said: "It's my first ride (for The Queen). I cannot get more happy than that. It's more than a winner in my eyes.
"He's a lovely horse, he has a big attitude, he really answered really well.
"The trained told me to put him behind the pace. I was travelling just behind the first two, really cantering all the way."
"It's nice to win, but for Her Majesty it's something else."
Bell added: "It's my first Group winner for The Queen, so that's a real tick in the box.
"He's such a deliverer this horse, he's very, very brave.
"It's been a nice surprise, dropping him back to a mile and a quarter, so we've opened up a lot more options.
"I'm just delighted to win today.
"(Mosse) a world-class jockey. If you're lucky enough to ride for The Queen, it's a Brucey bonus!"
Earlier, Second Step outclassed his rivals to win the Sri Lanka August Stakes.
This Listed prize looked to be at the mercy of the 6/4 favourite on his best form, unless Across The Stars was able to rediscover his having been gelded.
Sir Michael Stoute's runner proved disappointing, albeit with an interrupted passage, whereas Jamie Spencer kept things simple aboard the Roger Charlton-trained winner.
Settled in second behind the front-running King Bolete, Second Step took control three furlongs from home and made a beeline for the rail, where he was able to power on to a convincing success.
Law And Order ran on from the rear to take second, with King Bolete doing well in the end to cling on for third having stepped out of handicap company for this.
"He's a lovely horse, he's been around a while but he's been holding his form," said Spencer.
"He never wins very far - he generally dosses a little in front. This is probably as far as he's ever won."
Asked about future targets, Spencer confirmed that a step back up in grade was likely.
"We'll try and dodge Group One horses in Group Threes!" added the jockey, referring to a previous second behind a rival with higher aspirations.
Charlton added: "I'm thrilled. It's very nice when old horses keep doing it.
"He's still enthusiastic but he'll have one more race this year.
"He'll have a holiday and come back into training next year."