The film shows, Denniston, who was a commander at Bletchley Park where the Nazi Enigma code was broken, as the main adversary to Alan Turing, played by Cumberbatch, and is seen arguing against the mathematician's methods and looking for any excuse to get rid of him, said The Hollywood Reporter.
Dance himself has described his character as a 'pompous prat'.
In a letter to The Daily Telegraph, seven of Denniston's grandchildren and his goddaughter, who were not consulted during the film's research phase, complained that he has been misrepresented and paid tribute to him.
His granddaughter, Judith Finch, added, "He is completely misrepresented. They needed a baddy, and they've put him in there without researching the truth about the contribution he made."
Film's screenwriter Graham Moore and the film producers, in response to the criticism, said that Denniston was one of the 'great heroes' of Bletchley Park.
