The Sun, an insider said: "This has been a massive challenge to stage and has cost a fortune, not to mention weeks and weeks of construction. "But when it came to the big day, it went horribly wrong."They went on to say: "The idea was for the stuntman to land on some huge pillows filled with card to cushion the blow, while the bike safely crashed to the ground a few metres away."Unfortunately, it was miscalculated."The mole went on to reveal just how the freak accident occurred, insisting it was down to the hot weather."The heat and the friction of the tyres meant that when the bike crashed, the cardboard padding sparked and went up in flames."The smoke was so bad they had to close a nearby RAF airfield."Fortunately, nobody was hurt but.
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