Hayden took an unusual route into veterinary medicine; first completing a degree in equine science, where his thesis examined the effects of jetlag in racehorses, before graduating from Bristol as a fully qualified vet in 2010. He joined the team at North Park immediately after graduating, starting off in mixed practice before fulfilling a lifelong ambition when moving across to specialise in horses, with a particular interest in medicine. Hayden has ridden all his life, and is a reformed showjumper who now spends his spare time hunting and team chasing. He also attends several point-to-point meetings as the on-duty vet, and enjoys part-owning a point-to-point horse called Ted Speed.