On 22 March 2017, during a terrorist attack on Parliament, Ellwood gave mouth-to-mouth resuscitation and CPR to police officer Keith Palmer, who later died of his injuries. Ellwood was called a "hero" by those at Westminster and the press, as photos surfaced of him with blood on his face while he crouched over the body of the dying police officer. Consequently, Ellwood received a lot of praise on social media for his actions, as well as being promised an appointment to the Privy Council for his response in the attack. Ellwood's appointment to the Privy Council was formally approved on 12 April 2017.