Tristan transitioned from rowing to triathlon in 2007. Herbalife and the London Triathlon spotted his talent and potential and sponsored him that year where he quickly progressed to be a top amateur in his age group. With his overwhelming drive and commitment to the sport he has taken this further and has represented Great Britain, at age group level at both Olympic and 70.3 distances, being the first age group British man home at the 2008 ITU World  Championships.

Tristan aims to break into the professional scene in 2010 with the long term aim of racing Ironman.