TredFlex supported Shaun as he prepared for his run, which has raised £2,744.73 so far for the Meningitis Research Foundation.
The marathon was the latest in a long line of charity challenges for Shaun, who completed the Machu Picchu trail in 2012 and climbed Mount Kilimanjaro in 2014 in aid of the children's cancer charity the NC TLC Trust.
Shaun chose to support the Meningitis Research Trust because he suffered bacterial meningitis at eight months old which left him deaf in one ear.
Lindsey Robertson of TredFlex said: "We're proud of Shaun completing the London Marathon in four hours 53 minutes and 18 seconds, raising funds for a charity that is close to his heart.
"We've been delighted to help him promote his fundraising campaign through all the months he's been training. Supporting local individuals who contribute positively to the community is important to us as a small, local company."
Using the finest premium graded leathers and 100 per cent natural rubber soles, the TredFlex collection includes a wide range of boots and shoes to suit any occasion. All of the online range are fitted with the exclusive 3D system technology, a combination of the Air and Comfort System. With memory foam footbed, extra thick memory foam heel and arch support, active charcoal foam foot-beds with odour control, additional foam layer with anti-bacterial treatment and additional perforations for ventilation to allow your feet to breathe, the 3D system gives ultimate comfort for everyday wear.
For more information visit www.tredflex.co.uk
Anyone who would like to donate can still do so through Shaun's JustGiving page www.justgiving.com/Shaun-Sannerude or via TredFlex on 01536 791227