In Biggles Scores a Bull, Lord Dubray was a stock-breeder whose prize bull, "The Pride of Dubray" was the second animal to be stolen in a series of thefts by a cattle-rustling gang.
Dubray maintained a stock-farm at his residence, Framling Towers, in Norfolk. A former Colonel of the Life Guards, Dubray knew Bertie's father very well as the former Lord Lissie was also a stock-breeder and one who, as Dubray put it, spoke the same language as he. Dubray was, as Bertie warned Biggles before their first meeting, gruff and outspoken in manner. But this, according to Bertie, should not be taken too seriously. As Bertie put it, Dubray's bark was wrose than his bite. Dubray had once told Bertie that himself.
After an initial rough meeting occasioned by Biggles landing a helicopter unannounced at Framling Towers, Dubray turned out to be extremely cordial and helpful in the investigations to recover the stolen bulls. His information provided a number of important leads for what was otherwise a msystifying case. Dubray was the first ot put Biggles on the trail of Walter Thellin who had visited Framling and made a offer to buy the bull. Dubray recalled that Thellin was a persistent person who wouldn't take no for an answer and that he was acting on behalf of someone else.
Later, when Biggles had established that Thellin's principal was one Don José Cordino, Dubray extended this lead by telling him that Cordino had in fact come to visit Framling Towers himself in the past and had also been interested in the bull. On that occasion, Cordino had purchased some heifers and had shipped them back on a ship named the Juanita, which proved to be another important cluse in the case.
At the end of the story, Dubray sent a telegram of congratulations to the Air Police for solving the case and the recovery of his bull. He also invited Bertie, who had been seriously wounded in the course of the investigations, to spend his convalescence at Framling Towers.