The John and Thady Gosden-trained filly set a tall standard on the pick of her form, and she certainly came close to her best when producing a sparkling performance in the mile Group 1 prize.

Positioned behind the pace under Dettori, she travelled powerfully in the hands of the Italian maestro and the daughter of Frankel continued to tank her way throughout the mile contest.

The eye was always drawn to the Cheveley Park-owned four-year-old and as Frankie looked for room towards the far side rail, it was soon clear which of the eight fillies were travelling best.

Inspiral carted herself to the front of the field, still with three furlongs to travel, but a dazzling turn of foot soon saw her open up a sizeable advantage on her seven rivals.

Dettori, embarking on his swansong season, asked the multiple Group 1-winning filly to quicken approaching the two marker and the response was nothing short of exceptional.

French raider Mqse De Sevigne, a dual Group 1 winner in her own right, moved through the pack into second but failed to match the gears of the 10/11 market leader, who was fully in command from some way out.

Mqse De Sevigne kept on well once meeting the rising ground, but the gap was a convincing three and three-quarter lengths at the line, with the supplemented Heredia finishing back in third.

It was a performance that allowed Dettori plenty of time to celebrate, with the Italian superstar holding up five fingers to the crowd crossing the line. Further celebrations followed with Dettori producing his trademark and popular flying dismount.

A delighted, yet somewhat relieved Dettori said: "She would prefer a much stronger tempo,"

"I know she's got a crescendo of three furlongs and I didn't want to mess around; I thought 'come on let's go, come and catch me' and there was daylight, and she strode out really well. She's a super filly when she's on song and today she was.

"I had the gap between Oisin and Saffie and Saffie decided to join us, and I didn't want to mess around by looking for gaps, so I thought give her some clean air and use her stride because I know she's got one and once I got there, slingshot down the hill and it was all over.

"She gave me a nightmare ride in France; she was a flowerpot knocking people over, but today she was good. I was quite worried why she was so quiet, sometimes when they're quiet they can be over the top or coming into season but that wasn't the case, she was quiet because she was having a good day!

"When I got to 499 last week, I thought at least I've got Inspiral to look forward to as I knew she would be there or thereabouts. I didn't know until last week when Amy Starkey, one of the Newmarket directors, told me I was so close. It is my home and it's fantastic to be able to do it on a Group 1 on a special filly; I couldn't have written a better ending.

"I woke up with a knot in my stomach, I didn't feel myself, nervous, sad, emotional but at least I got it done and I've got two weeks left."

John Gosden, who trains Inspiral in partnership with his son Thady, added: "She was in top form today. The ground was quick, and she runs on anything bar the heavy of Goodwood. She showed a lot of class today there is no doubt about it. She travelled well and there was a good pace. Andre [Fabre's] dual Group 1 winner from Deauville was second so it is solid form.

"We missed the Lockinge as she had a muscle spasm problem so by the time, we got to Royal Ascot she was only about 80 per cent fit. She was only beaten a neck that day and she got a touch tired in the last half a furlong, but she has been faultless since. She had an elaborate piece of work in the Sussex Stakes, but we were clear if she didn't handle the ground we would wrap up on her and head to Deauville.

"There was a lot more pressure on today as she is a very good filly, and the ground is quicker here than we would expect to find here in the autumn. It is real fast summer ground, but she has run absolutely superbly, and I couldn't be more pleased.

"Plans, we will see. She is in the QEII, and she could be entered at the Breeders' Cup, but we won't make a decision for at least a week or two. I always want to see how they are two or three days after the race before making any grandiose plans, let alone plans. They would be the two options if she is in good nick. One lady will decide if she races on, and that is Mrs Thompson. That was only her fourth run this year and she [Inspiral] is weighing the heaviest she has ever weighed.

On the achievement of Dettori riding 500 Newmarket winners, he added: "It is lovely. What a way to do it in a Group 1. He is an absolute icon. He is wonderful and he has been great over the years to work with and continues to be so. I'm sure I'll be running some horses in California for him.

"He is great to work with in the mornings and not all jockeys are like that. He is a great judge in the mornings on his work and I will miss him there as much as racing in the afternoon strangely. I would have thought when he retires, he fully retires.

"He is doing it cleverly. He is not just stopping bold. He is doing it the right way. He is bringing it down gently. He will be riding in Japan, Hong Kong, California and in the Middle East in the winter. Where there are big races, he will pop up. I don't know that [if he was to carry on riding in Britain after this year], but it would be a huge thing."

Paddy Power reacted first by cutting the winner from 6/1 to 3/1, joint-favourite with Warm Heart, for the Breeders' Cup Fillies' and Mares Turf at Santa Anita in November.