"He has been around the racing all the time, so it was going to be a natural thing at some point," Tim said.
George said the adrenaline was the "biggest thing" that he enjoyed about racing.
He has to be careful of the placement of his race belts because of his stoma, but is not affected beyond that.
He told BBC Radio Derby in the past few weeks he had made a concerted effort to raise awareness of Crohn's and when racing he often walks around the paddock proudly showing his stoma bag.
George said people were often intrigued about it and wanted to ask questions. He wanted society to see it as a "more common sight".
Asked what his message would be to others with Crohn's disease and Colitis, he said: "It may look bad now, I thought it was really bad at the time, you have to go with every day and when you have some good days take that as a win.
"Eventually it will all come together and you will be able to live life normally again."
In his latest challenge, George is taking part in the 24-hour C1 Eurocup race in Portugal this weekend.
Eventually his goal is to race in the British Touring Car Championship.