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It took close to a gruelling six hours, but a determined father completed 26.2 miles and in doing so broke a new Guinness World Record.
Dave Cooke decided to run in full chain mail, looking as if he had just returned from the Crusades.
How he looked was not the problem, the issues came because the metal suit weighed 20kg (44lb).
The father-of-two, from Coller Crescent, Dartford, has previously completed six marathons, but that did not prepare him for how tough Sunday was.
The previous record for the marathon being run in chain mail was set by Michael Dodd, from Essex, who ran it in five hours, 49 minutes and seven seconds in 2014.
Dave just pipped him, running it in five hours 45 minutes.
The school-worker and volunteer football coach said: “I’m really pleased. I got amazing support from everyone, my friends, family, girlfriend, kids. I’m definitely not tempted to ever do it again, that is definitely my last marathon.”
So far Dave has collected more than £2,700 for the London Air Ambulance, but more is still expected in and he is hoping to have raised £3,000 in total.
Dozens of other runners from the towns competed, for full profiles on how they did see this week's Gravesend and Dartford Messengers:
Liz Hiscutt: four hours 42 minutes
Fred Roberts: four hours 33 minutes
Sam Pulman: four hours 52 minutes
Mark Mooney: three hours and 19 minutes
Ali Day: five hours 15 minutes
Joe Hamshare: five hours 27 minutes
Sophie Warren: five hours 15 minutes
Robert Standing: five hours 58 minutes
Steven Knight: four hours 35 minutes
Norman Grimes: six hours
Graham Ward: four hours 58 minutes
Liz Hiscutt: four hours 42 minutes.