[4] Prinsley is an otorhinolaryngologist by profession (a physician specialising in diseases of the ear, nose, and throat).

Prinsley has been a regional director for the Royal College of Surgeons,[8] and was the chair of the Norfolk Deaf Association.

[13] He defeated Conservative candidate Will Tanner, who had previously served as the Deputy Chief of Staff to Prime Minister Rishi Sunak.

He campaigned in an old Post Office van, decorated with photographs of him in surgical scrubs, becoming one of the oldest first-time MPs.

[16] Mr Prinsley's brother-in-law is John Schlapobersky, a group psychotherapist and anti-apartheid activist who was a Founding Trustee of the Medical Foundation for Victims of Torture.