Sam James enjoyed his biggest day in the saddle, with Poptronic all heart to deliver a surprise victory in the Qipco British Champions Fillies & Mares Stakes at Ascot.

A winner of the Lancashire Oaks earlier in the season, Karl Burke’s four-year-old was sent off at an unfancied 22-1 after disappointing in Group One company the last twice.

However, she showed her quality on British Champions Day and having been to the fore throughout in the hands of James – who was striking at Group One level for the first time – she had plenty in the tank as those from a positions further back presented a stern challenge in the closing stages.

Both eventual second Bluestocking and the 3-1 favourite Jackie Oh in third stayed on stoutly to push Poptronic all the way inside the final half-furlong, but they could not get by the gutsy northern raider, who finished a neck clear at the winning post. Frankie Dettori had to settle for fifth place with Free Wind.

Time Lock and Bluestocking give owner-breeders Juddmonte a strong hand in the Qipco British Champions Fillies & Mares Stakes.

Time Lock has made steady progress throughout the season for the training partnership of Harry and Roger Charlton and appears to have hit form at just the right time with Qipco Champions Day in mind judged on an impressive Group Three victory at Newmarket three weeks ago.

The Ralph Beckett-trained Bluestocking finished third in the Ribblesdale Stakes, second in the Irish Oaks and fourth in the Yorkshire Oaks earlier in the season, but was unable to make the most of having her sights lowered when touched off by Al Qareem in a Listed event at Chester last time out.

Juddmonte’s racing manager Barry Mahon admits testing conditions at Ascot will not be ideal for either filly, but feels both merit their place at Ascot.

“They’re two lovely fillies, the ground is an obvious concern I suppose for both of them, but they have both shown they can handle it on occasions,” he said.

“Time Lock ran well on Goodwood on heavy ground when she finished third in the Lillie Langtry and obviously Bluestocking was second in the Irish Oaks on soft ground, so they have run well on soft before, it just depends how testing it is.

“It’s the end of the season, it’s a lovely place to finish up and it’s nice to have both of them in it with a chance.”

Time Lock would be a popular winner for Derby-winning trainer Roger Charlton as he prepares to fully hand over the licence to his son Harry at the end of the season.

“She is in great form and is on the right path, growing in confidence with her success. It looks very competitive with a big field but she’s in as good form as any of the others at the moment,” said Charlton junior.

“It’s hard to be too confident as the conditions aren’t ideal. We’d be going with more confidence if they weren’t looking at so much rain, as good ground would have been ideal, but she handles soft.”

The likely favourite for the Group One contest is John and Thady Gosden’s Free Wind, one of five rides on the day for Frankie Dettori on what is set to be his final competitive appearance in Britain.

The five-year-old was well held in the Prix de l’Arc de Triomphe three weeks ago, but her narrow defeat at the hands of Warm Heart in the Yorkshire Oaks in August arguably sets the standard.

“Free Wind found the ground a bit lively in the Arc. Frankie looked after her and that’s one of the great things about him, he’s very quick at knowing when they aren’t enjoying it,” said John Gosden.

“He wrapped up on her with 400 metres or so to go and that’s why I can entertain running her again here – she seems in good form.”

Aidan O’Brien saddles Jackie Oh, who was narrowly denied an Arc weekend victory when touched off by Blue Rose Cen in the Prix de l’Opera.

The daughter of Galileo will be tackling a mile and a half for the first time this weekend, but O’Brien does not expect the longer distance to be a problem.

“We always felt a mile and a half was within her compass and ease in the ground will definitely be a help to her. She’s very genuine and we’re really looking forward to her,” he said.

William Buick will partner Time Lock for the first time this season in the Qipco British Champions Fillies & Mares Stakes at Ascot.

Narrowly beaten by fellow Juddmonte-owned filly Haskoy in the Galtres Stakes at York last year, the daughter of Frankel was beaten on her first four starts of the current campaign before registering a confidence-boosting Listed success in France last month.

That teed Time Lock up for the Group Three Princess Royal Stakes at Newmarket two weeks ago and she again impressed under Ryan Moore, to leave connections eyeing up a tilt at Group One glory on Qipco British Champions Day.

Harry Charlton, who trains the four-year-old in partnership with his father, Roger, said: “Time Lock is in good form and the Ascot race looks the obvious race for her to run in.

“As long as the Juddmonte team are happy and the filly is in good form then we’ll look to run her there and William Buick will ride her.

“William rode her twice last year, he rode her at Haydock and was second on her in the Galtres, and he’s been saying all year if there was ever a chance he’d love to ride her again.

“Charlie (Appleby) hasn’t got a runner in the Ascot race and Ryan Moore, who rode Time Lock last time, will ride one of Aidan O’Brien’s, I assume, so that’s really the reasoning.”

Charlton feels a combination of boosted confidence and the prevailing ground conditions at Newmarket contributed to her uplift in form.

He added: “The race she won in France was not a strong one, but she won it well and it might have just given her a little bit of confidence.

“More than anything, we ran on very quick ground at Haydock twice earlier in the year and then very soft ground at Goodwood. I think in the middle ground, like she got at Newmarket the other day, probably suited her on a nice, galloping track like that.”

Last weekend the Charlton team came mighty close to landing the Cambridgeshire at Newmarket, with ante-post favourite Greek Order beaten half a length by Astro King in the prestigious handicap.

The three-year-old son of Kingman could return to the Rowley Mile next month in a bid to go one better.

“He’s come out of the race great. He didn’t win, but he ran a super race and we couldn’t be happier with him really,” said Charlton.

“We were under no illusions that because he went off such a short price (5-2) it was sort of assumed that he would win, but we all know winning 35-runner handicaps is not that easy and there are plenty of variables at play.

“We would have loved some rain and it didn’t come, but we’re proud of him and it’s onwards and upwards from here.

“If he’s OK and as long as Prince Khalid’s family are happy, we’ll have a look at running him in the James Seymour Stakes at Newmarket on November 4. It’s a Listed race over 10 furlongs, which is probably more his trip, and the ground might be a little softer by then as well.

“It was the quickest ground he’s run on in the Cambridgeshire and he obviously handled it, but we think he might be a little bit better with some cut.”