Three strong favourites justified their status on the last day at Royal Ascot on Saturday to give bookmakers one final pounding - yet one of their own was responsible for much of their woes.

The damage was done by a horse owned by David Power, who co-founded the dynamic Paddy Power betting chain 25 years ago.

From the moment he left the stalls there was never much doubt Slade Power, the 7-2 favourite, would win the Diamond Jubilee Stakes.

And that after the same owner's Sole Power landed some hefty bets to win the King's Stand Stakes on day one of the meeting.

Slade Power underlined the prowess of his Irish trainer, Eddie Lynam, who enjoyed his third winner of the week.

In addition to Sole Power, Lynam also saddled Anthem Alexander to win the Queen Mary Stakes.

Between them, Slade Power and Sole Power have now won more than STG2 million ($A3.65 million).

Their successes all but mirror the fortunes of the Paddy Power business. The company has spread its tentacles as far afield as Canada and Australia in posting worldwide turnover of 6 billion euros ($A9 billion)last year.

"You think it's too much to believe you might have one winner, so to have two is sensational," Power said.

"We were happy just to have two runners here."

Lynam, meanwhile, played down his achievement of saddling three winners during the meeting from his small string of horses.

"I enjoy having winners here more than anywhere else, but it's just coincidence to have had three here this week," Lynam said.

"I just happened to have the best horse in each of those races."

On another day of unbroken sunshine, Ryan Moore rode three more winners to secure the honours as the week's leading jockey. And Sir Michael Stoute, for whom Moore rides, claimed the trainer's title after Telescope and Arab Spring added to his winning haul.

Telescope showed why he has been so highly rated by connections with a spread-eagling triumph in the Hardwicke Stakes.

The five-year-old prevailed by seven lengths, in the process posting the longest winning margin of the week.

Arab Spring, for his part, defied top weight in the Duke Of Edinburgh Stakes and looks ready to contest stronger races throughout the northern summer.

Stoute inched out John Gosden in a count-back for the trainers' accolade after the pair ended the week with four winners apiece. Gosden reached that mark in the Chesham Stakes when Richard Pankhurst - whom he trains for his wife, Rachel Hood - ran clean away with the prize.

Appropriately, Moore brought the curtain down by winning the final race, the Queen Alexandra Stakes, aboard the Willie Mullins-trained Pique Sous.

However, the race ended in tragedy when Tiger Cliff collapsed soon after he passed the winning post in fourth place.

Veterinary examination revealed the horse had suffered a heart attack in much the same spot where Thomas Chippendale met with the same fate after winning the Hardwicke Stakes on this day 12 months ago.

Moore, who was at the top of his game throughout the week, said his only regret was not riding a winner for Queen Elizabeth.

"It has gone really well and I'm delighted because this is our shop window," Moore said.

"Most of the horses ran as we expected, although it's shame I couldn't ride a winner for the Queen."

Moore finished second on both Estimate and Bold Sniper for a monarch whose daily enjoyment of Royal Ascot helped to draw increased attendances over the five days.