One For Arthur, who became Scotland’s second winner of the Grand National at Aintree last April, has been ruled out for the season with a leg injury by his trainer, Lucinda Russell.

The horse had come back into training at Russell’s yard near Kinross with a planned first run of the season at Kelso later this month and was already the ante-post favourite to become the first horse to win the Grand National twice since Red Rum in the 1970s.

However, Russell discovered a tendon problem in his right fore. "He's out for the season. It's not a big injury, but it's enough for us to stop with him,” she said. "It's obviously a shame, but hopefully we can get him back to full fitness."

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One For Arthur, who also won the Classic Chase at Warwick last season, had completed his first piece of work when “he was found to have disrupted fibres in his right-fore superficial flexor tendon,” she added.

Given that One For Arthur is only an eight-year-old Russell is hopeful that he can return. “Arthur's Grand National win has changed our lives, and we are eternally grateful to him,” Russell said. “Arthur's welfare comes first and his rehabilitation will be tailored to bring him back for the Grand National in 2019.”

While Russell’s plans are now on hold everything went to plan for Rab Havlin at Lingfield Park.

Havlin, returning from an eight-month suspension imposed by the French racing authority, was riding Purser for John Gosden in the Injured Jockeys Fund EBF Novice Stakes.

Purser was the 4-9 favourite and won just as the price indicated, quickly away from the stalls and kicking clear off the bend to win by nine lengths.

“That’s a relief,” Havlin said. "I was looking at the day saying there was no pressure, but when I pulled up after the line I thought 'thank God for that'. Nothing went wrong. They're never winning until they've passed the line, but he's done it well.

"It was obviously a bit of a plan to get me to come back on a winner and it's nice of Frankie [Dettori] to step aside and let me ride him. He didn't take too much persuading to have another day off."

William Buick returns from eight weeks on the sidelines, after a compression of his T12 vertebra, and Blue Point in John Guest Bengough Stakes at Ascot tomorrow.