The Master Imp gelding got out of the horse-walker at his co-owner’s yard in Ireland on 14 February and galloped on to the road, where he was hit by a lorry. “Mossie” died instantly.

Arthur Comyn, who owned the horse with Polly, told H&H he was “very angry” with himself for being “careless”.

“I didn’t shut the gate [on the walker] properly,” he said.

Mossie, who was 13, had been on box-rest with Mr Comyn since October, after scans revealed he had a small hole in his tendon.

The injury meant that the horse had to be withdrawn before the dressage at the European Championships in Luhmühlen last August.

“He was over the injury. I was so happy that he had recovered,” said Mr Comyn, who lives at Westwood, Mallow, in Co Cork.

“I was walking him out in-hand and was contemplating turning him out,” he added.

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