Third on his only other previous run, the Peter Chapple-Hyam trained colt powered home in the final furlong of the Group One contest.

In a finish dominated by outsiders, the Montjeu colt won by a length and a quarter from 33-1 shot Charlie Farnsbarns, with Medicine Path (20-1) two lengths further away in third.

Prince Golan took the field along in the early stages, with Malacara and Drumfire close up down the straight mile.

The race was wide open three furlongs out and a host of horses were still in with chances.

Petara Bay and Charlie Farnsbarns made their bids, but it was Authorised on the near side who came fast and late to claim the last big race of the year in Britain and stake his claim for the Vodafone Derby. The winner was slashed from 12-1 to 33-1 for the premier Classic at Epsom with VC Bet.

Winning jockey Frankie Dettori said: "I must say I have to thank the owner as I tried to put him off running the horse as mentally I didn't think the horse was ready for this kind of field.

"We knew he had the talent and the race went very smoothly. He won like a good horse. When you press the button you hope they can carry on. He sure did and what a true professional he is.

"Peter asked me to ride him work and he gave me a wonderful feel. He had a lot of faith in him and he has been proved right today."

Chapple-Hyam added: "I was disappointed when he got beat first time out, but he did blow up.

"I've always thought he was a serious horse and he just improves and improves all the time. He's a maiden and it's not really my way. We wondered what to do. There was a maiden at Leicester the other week which he probably would have won, but we decided to come here and give it a go.

"I was still unsure about the ground until about half an hour before the race and then when our horse (Striving Storm) ran so well in the first I thought he'd be OK."

Brian Meehan, trainer of the runner-up, said: "He ran a lovely race the last time at Ascot and I don't know what happened the time before in the Goffs Million.

"Ryan (Moore) says he has run as straight as a gun barrel today. He'll have the winter off and he's a nice horse for next year. We'll look at bringing him back in something like the Craven or the Feilden."

Aidan O'Brien was not too downhearted with the effort of Eagle Mountain, who finished fourth after being sent off the 8-11 favourite.

"Mick (Kinane) said the ground rode heavy. It was soft at the Curragh last time, but nothing like the heavy they have here today. It was a bunchy race, but he has stayed on and wasn't stopping at the finish, " he said.

"I'd imagine that will be it for the season and with the way he has run, you'd think he might get further next year."