David Cranson, 63, will be competing in the famous challenge, now in its tenth year, for the second time.

This will be David’s 23rd fundraising challenge for Blind Veterans UK since joining in June 2007. David, who has bilateral optic atrophy, says: “I’ve now been with the charity for over 10 years. They’ve truly got my life back on track!

“When I first started receiving support and they found out I liked sport I was invited down to the sports department in their training and rehabilitation centre in Brighton. After that, things just spiralled out of control!”

David, who served in the Royal Artillery from 1971 to 1975, began his fundraising endeavours in 2009 with the famed 100k London to Brighton challenge, a gruelling 24-hour endurance test that saw David compete on the back of a tandem. Since then, he’s completed eight Olympic distance triathlons, four sixty-mile tandem drives, three Great South Runs, three Brighton Half Marathons, one Royal Parks Half Marathon, one London Marathon, one Brighton Marathon and one South Downs Way 75-mile five-day trek.

He summarises: “There’s no stopping me now! There’s been no stopping me since 3 June 2008. In total I’ve raised £2,312 for the charity and it’s just been a tremendous journey, Blind Veterans UK has introduced me to so much. This year’s Royal Windsor Triathlon was my eighth consecutive triathlon!

“I average about three a year; one in January, one in summer and one in autumn. It’s just what I needed. The crowds at these events are unbelievable; when I hear someone shout my name I shed a tear, I cannot tell a lie. It’s just the most incredible buzz.”

David, who won the Outstanding Achievement Award at the Blind Veterans UK Founder’s Day Awards in 2012, is keen to encourage any beneficiaries to get active within the charity in any way they can. He says: “I would explain to any blind veteran, new or old, exactly where I was when I became part of the charity. It was a dark place. A very dark place indeed. Despite that, I can now say I am totally fulfilled.

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“What I’ve been asked over the years is to develop the three a’s: accept, adapt and achieve. That’s now my motto! So to any beneficiary, I’d say get down to the Brighton centre and find your level. Whether that’s in IT, Art and Craft or sport. It doesn’t matter what it is, all that matters is getting on and improving your life.”

The Royal Parks Foundation Half Marathon, which takes place on 8 October takes you through Hyde Park, Green Park, St James’s Park and Kensington Gardens. For a registration fee of £30 and a minimum sponsorship pledge of £300, participants can still sign up to run on behalf of Blind Veterans UK. Visit the website to find out how you can get involved.