[4] He was trained throughout his professional racing career at Arlary near Kinross in Scotland by Russell, assisted by her partner Peter Scudamore.

[5] His dam Nonnetia, who won one race over hurdles in France,[6] was a granddaughter of Wavy Reef, the female-line ancestor of the Irish St. Leger winner Duncan.

In the 2015/2016 season, One For Arthur was campaigned in novice steeplechases and made a successful debut over the larger obstacles when winning at Kelso in October.

In the Classic Chase at Warwick Racecourse on 4 January, One For Arthur was assigned a weight of 151 pounds and started at odds of 14/1 in a field of 20 chasers.

[11] One For Arthur was assigned a weight of 10-11 (151 pounds) for the Randox Health Grand National over four and a quarter miles at Aintree and started at odds of 14/1 in a forty-runner field.

He was ridden by Derek Fox who had just returned from injury having sustained a broken wrist and a dislocated collarbone in a fall on 9 March.

One For Arthur overtook the favourite approaching the final obstacle and stayed on up the run-in to win by four and a half lengths from Cause of Causes, with Saint Are taking third ahead of Blaklion.

[15] After his Grand National victory, One for Arthur had a break of twenty months, returning to the racecourse in December 2018 for the Many Clouds Chase at Aintree in which he unseated his rider.