A couple from Oxfordshire are campaigning to increase awareness about seizures after their young son contracted a rare illness which left him with brain damage.
Three years ago, Oliver Johnson, who is now six, had a huge seizure and was diagnosed with encephalitis, which results in the brain swelling.
"He was my soul mate, he was my best friend, we did everything together and that has gone."
Oliver now can't walk or talk and needs to be fed with the help of a tube. His seizure came after a short period of feeling unwell.
Mark McQuillan has been speaking to his parents, Mike and Suzy Johnson.