The Derby 2015: Frankie Dettori mount Golden Horn 'going well'

Dettori riding his Investec Derby mount Golden Horn at the 'Breakfast with the Stars' event at Epsom

Jockey Frankie Dettori says Investec Derby favourite Golden Horn "didn't turn a hair" as he faced up to the famously tricky contours of Epsom racecourse for the first time.

Dettori rode the unbeaten colt, trained by John Gosden for owner/breeder Anthony Oppenheimer, in a light workout at a 'Breakfast With The Stars' event at the track.

The impressive winner of the often-significant Dante Stakes at York was joined by Gosden's Dante runner-up Jack Hobbs and Epsom Oaks hopes Star Of Seville and Jazzi Top on the familiarising trip.

Dettori, who said Golden Horn saves his best for racedays, told BBC Sport: "It was only an exercise round Tattenham Corner and he seemed to handle it really well.

"He's a very laid-back character - he needs a crowd to rev him up. He didn't turn a hair, and it's going well."

Because of a lack of big-race mounts, Golden Horn is Dettori's first ride for four years in a race he has won once - at his 15th attempt, on Authorized in 2007.

And the three-time champion jockey, 44, admitted he's feeling the pressure - as he did eight years ago.

He said: "I won't be sleeping for a while, until Derby day.

"Before Authorized, because it was one that had eluded me for so many years and I wanted to win so badly, I did have some sleepless nights for a long while before the race.

Frankie Dettori makes his trademark leap from 2007 Derby winner Authorized

"This year, I'm older and wiser, and I've been there before, and trying to take it in my stride, but the Derby's the Derby."

To my suggestion it was surprising somebody with a reputation as an unflappable showman as well as a top jockey should suffer from nerves, he added: "You can ask why the footballers get excited at the FA Cup final or Formula 1 drivers at the Monaco Grand Prix.

"It's a big thing for us, and it doesn't get any bigger than the Derby."

With his horse not originally entered for the mile-and-a-half Classic, Oppenheimer - who'd been convinced a quarter mile shorter would suit Golden Horn best - will pay a £75,000 supplementary (late) entry fee.

Jack Hobbs is also set to line up after pleasing the Gosden team with the manner in which he breezed around the famous track under jockey William Buick.

Buick rode Golden Horn to his Dante Stakes success, with Dettori on Jack Hobbs. They're swapping over because the Italy-born rider is enjoying a fruitful association with the stable since Buick switched to Sheikh Mohammed's Godolphin operation, which has bought half of Jack Hobbs.

Also taking in the course was the Andrew Balding-trained Elm Park, who did not appear to relish the topsy-turvy course quite so much.

Jockey Andrea Atzeni is unsure as to whether he will ride Elm Park at Epsom in June

Put on the spot about whether he'd definitely ride the colt - owned by his employer Qatar Racing - as opposed to one of their possible late entries, Karpino or Sumbal, jockey Andrea Atzeni hesitated enough for bookies to lengthen Elm Park's Derby odds.

Meanwhile, as Irish champion trainer Aidan O'Brien goes for a fourth win on the trot, it looks like he's set to field a less strong team than usual.

Chester winner Hans Holbein and Kilimanjaro, successful at Lingfield, are the only definite contenders, but filly Found could be supplemented.

And Dermot Weld, another Irish trainer with his sights on Epsom, said he believed there were "question marks" over the stamina of his Derby hope Zawraq.

The Investec Derby will be live on 5 Live Sport at 16:30 BST on 6 June