As thousands of runners took to the streets of London, a soldier overcame sizzling heat to run his own marathon in Afghanistan - completing the "struggle" on a treadmill.
Staff Sergeant Paul Chamberlain, 36, of the Royal Corps of Signals, completed the race in Helmand in a time of three hours and 33 minutes
Originally from Eaton, Norwich, Sergeant Chamberlain raised £1,000 for Help for Heroes and SSAFA Forces Help.
Normally based in Tidworth, he was deployed to Helmand Province in March to work in the headquarters of Task Force Helmand as a computer software specialist.
He completed the marathon on a treadmill in the small gym on camp at Main Operating Base Lashkar Gah early on Sunday morning to avoid the worst of the heat.
A veteran of tours in Iraq and Bosnia, Staff Sgt Chamberlain said: "I knew a few people were doing the event in London and came up with the idea of running the marathon on the same day on the treadmill out here.
"I did the run early in the morning because it is just too hot here later in the day, but it was still a struggle."
This is the fourth marathon the serviceman has completed, having run the event in London three times in the past.
Staff Sgt Chamberlain, who has served in the Army for 17 years, added: "I wanted to do something for a good cause while I was out here and have supported both of my chosen charities in the past.
"I know people who have benefited from the work of Help for Heroes and SSAFA, and they support our families back home as well which is really important when we are out on operations."