Crokes Cross became the joint-highest priced winner in British horse racing history on Thursday – with trainer Stuart Coltherd failing to back her.Taking part in the action at Kelso Racecourse, the horse priced at 300/1 stunned everyone to claim victory.No-one expected Crokes Cross to race to victory at Kelso RacecourseThis was her stable debut for Coltherd and had looked well short of any form during two bumpers in Ireland.But with jockey Jamie Hamilton onboard, the seven-year-old scooped an unlikely victory despite the odds being against her.Her last three races saw her priced at 33-1, 6-1 and 66-1.Crokes Cross’ win also marked the end of a terrible run for Coltherd, who had failed to win with 102 runners over jumps since March 2025.View Tweet: https://twitter.com/KelsoRacecourse?ref_src=twsrc%5EtfwSpeaking about the win after the race, he told Racing TV: “It’s unbelievable, she’s just kept on improving.“I think it’s the nice sunny weather, she’s been getting out in the field and in the last fortnight she’s really started to thrive. She’s done it well today.”However, he clearly wasn’t too convinced as he failed to lump any money on.He remarked: “She’s done nothing wrong since she came over from Ireland.“She was sent over to me through a friend of mine just to see how we got on with her, and we went from there – it looks like she was worth buying!”Before quipping: “I never had a penny on, I wish I had!”Crokes Cross is now in the history booksView Tweet: https://t.co/1mxESjH6UHColthern then concluded by saying: “When they were going down and I saw she was 300-1, I did think that was a huge price as she works well at home – it’s too late now.”In the history booksCrokes Cross becomes the fourth horse in history to win while being backed at 300-1.Strangely, all of these winners have come in the last six years.Before that, the previous best winners were 250/1 with three of those, including one from 1990.But since He Knows No Fear claimed victory in 2020, there have been three other 300/1 winners, including Crokes Cross.And the rate of 300/1 winners is matched by the overall number of horses claiming victories when priced at more than 100/1.