The uptake of proton beam therapy has been slower in the UK compared with other developed countries; however, this is now set to change. In this insightful interview, Anthony Zietman, MD, from the Massachusetts General Hospital, Boston, MA, discusses the future of proton beam therapy in the UK, highlighting affordability, as well as the ability of the UK to integrate any successor of proton beam therapy. This interview was recorded at the 2017 National Cancer Research Institute (NCRI) Conference, held in Liverpool, UK.