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Blakeney was bred by his owner and trainer Arthur Budgett at Kirtlington, Oxfordshire. He was the first of two Derby winners produced by the Oaks runner-up Windmill Girl, the other being Morston who won the race in 1973. His sire, Hethersett, was a top class racehorse who won the St Leger in 1962. Hethersett and Blakeney are representatives of the Byerley Turk sire line, unlike more than 95% of modern thoroughbreds, who descend directly from the Darley Arabian.