A specialist doctor in Harrow is set to complete his 11th triathlon for Leukaemia and Lymphoma Research.
Simon Gabe, 51, originally from Buckinghamshire, was first inspired to get into the sport after watching his wife compete in the London Triathlon back in 2003.
Taking part in the first Blenheim Palace Triathlon in 2005, Simon Gabe has since took part in every race since.
Simon Gabe said: "As people often find, once you've done a sprint distance, and you’re hooked on triathlon you start to do more and more and you gradually increase your endurance ability.
"The year after my first sprint, I progressed to Olympic distance and also did two sprint distances. Every year I increase the amount of events I take part in and stepped up to 70.3 distance Ironman in 2011 and then full distance Ironman last year.
"Even though I've now reached this level of endurance, I always start each year with the Leukaemia & Lymphoma Research Blenheim Palace Triathlon.
"It is set in a fantastic location and always well-organised. It's such an enjoyable event that marks the beginning of my season."
James Robinson, managing director of event organisers IMG Challenger World, added: "It's fantastic to see participants like Simon returning year on year to take part in this amazing event.
"With its beautiful backdrop and freshwater lake it's an absolute must-do event for any keen triathlete. We’re looking forward to welcoming Simon back to Blenheim and to seeing the 7,000 other entrants at the start line come June."
The triathlon takes place on June 13 and 14, set in the surroundings of Blenheim Palace, seeing 7,000 participants take on super-sprint and sprint distance triathlons as well as team-relays.