It's been 7 years since the death of my brother Sean in 2008. He was 21 years old. He had an interest in engineering and aviation, and dreamed of designing aircraft. He was also on the Autism spectrum, though undiagnosed, and suffered with epilepsy.

As I got older I started to see things in him that I had already seen in myself - a lot of his quirks, mannerisms and even his walk, though his eloquent remarks, quick wit and, most especially, his sense of humour was vastly superior. I had become aware that I had been diagnosed with an Autism Spectrum Disorder at the age of 4. Suddenly, it all clicked. Even today I may say or do something and others are immediately reminded of him, and it was almost undoubtedly down to seeing the world through the same alternative lens.

Despite all the obstacles, he was always determined to not let any of them stand in his way and took it all in his easy, care-free stride. He was a great inspiration to many, a leader and friend, and not a day goes by that I don't miss him. But I hope that by keeping his memory alive he can still live on in the hearts and minds of all that had the privilege to have known him, and that those who did not get the chance can get to know him through my words and actions.

I am running a half-marathon in his memory for the National Autistic Society, a leading UK charity that supports the rights and interests of all people with autism. They also aim to raise awareness of autism and how it affects people like my brother and I on the spectrum.

Please help me in fundraising for a great cause that is close to my heart and donate what you can. Thank you.