Public response to the acquittal was that of outrage and a private appeal was brought against the verdict by Mary's brother, William Ashford. Thornton was taken to London where he was tried at the King's Bench. When Thornton was called upon for his plea, he responded, "Not guilty; and I am ready to defend the same with my body." He then put on one of a pair of leather gauntlets, which Reader handed him. Thornton threw down the other for William Ashford to pick up and thus accept the challenge, which Ashford did not do. By Ashford not accepting the challenge under the trial by combat laws, Thornton was freed, although by this time he gained a notorious reputation. In 1819, a bill was introduced and an Act passed to abolish private appeals after acquittals and also abolish trial by combat.

Sutton Coldfield was the focus of national attention in 1817 when a young woman named Mary Ashford was found murdered in the town. She had been attending a party in Erdington on the evening of 26 May 1817, and had left with Abraham Thornton and her friend Hannah Cox, who later left Mary and Abraham. The following morning, her body was recovered from a water-filled pit by Penns Lane. Thornton was quickly traced and arrested for her murder. At the trial, Thornton provided evidence that it was not possible for him to have killed Mary at the suggested time. As a result, the jury found him not guilty of her alleged murder and alleged rape, allowing him to walk free from the court.