Fireworks contractor Geoffrey Counsell, 51, who was in charge of a display held on the night of a massive crash on the M5 in Somerset in which seven people died and 51 were injured.
He was cleared of breaching health and safety laws today by a jury at Bristol Crown Court on the direction of a judge.
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The broadcast figure-turned activist died on Monday at her Los Angeles home from metastatic breast cancer, her family said.
Warm with some wet weather
Melissa Mead has been campaigning to raise awareness of sepsis after losing her one-year-old son William to the illness.