Chris's father, David Mapletoft, said he had no idea his son was taking the pills. He said: "He was already slim, muscular and well built. We just think this was (for him) just another pound or two coming away from the midriff and then he would look fantastic on the beach.
"It is all speculation. We don't 100% know that because we have no idea what he was thinking. I can't think of another reason."
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7-year-old George Lockley has Spinal Muscular Atrophy which means he uses a wheelchair and is slowly getting weaker.
The car has around 210bhp and can accelerate from 0-60mph in 5.5 seconds and hit a top speed of 150mph.
The engineering projects will hamper the plans of many people hoping to take advantage of the four-day weekend.