Sea Siren has confirmed a start at next month's Royal Ascot meeting with her second in the Doomben 10,000.

The triple Group One winning sprinter redeemed her BTC Cup failure when she beat all but three-year-old Epaulette in the Brisbane feature on Saturday.

A recent acquisition for international concern Coolmore, Sea Siren will be in the care of trainer John O'Shea until after she runs in the Diamond Jubilee Stakes, the race won last year by Black Caviar.

A daughter of Coolmore stallion Fastnet Rock, Sea Siren has been booked to be served by Galileo and will remain in Europe after she races at Royal Ascot.

O'Shea said the mare would go to Melbourne next week ahead of the trip to England on which she will be joined by Newmarket Handicap winner Shamexpress whose mission is the King's Stand Stakes at the Royal meeting.

Shamexpress hasn't raced since the Newmarket in March but pleased his jockey Craig Newitt in a jump-out at Flemington on Friday.

Newitt won the King's Stand in 2007 on the Lee Freedman-trained Miss Andretti and said he was certain Shamexpress would measure up.

"No risk he's improved," Newitt said.

"He's improved physically as well, he's a lot bigger and stronger."

Australians have fared well at Royal Ascot since Choisir famously took out the sprint double in 2003.

Takeover Target won the King's Stand in 2006 and Miss Andretti's win was followed two years later by Scenic Blast.

Starspangledbanner, trained in Australia to Group One wins by Leon Corstens, won the 2010 Golden Jubilee which was renamed last year to honour the Queen's reign.

Danny O'Brien, trainer of Shamexpress, is no stranger to Royal Ascot having taken Star Witness to England two years ago where the colt was placed in both the Group Ones.