Technical problems began this morning at 9am. By around 11:30 Heathrow said staff had restored partial check-in for hold baggage. By 11:45 all check-in services were returning to normal.
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The film had formed part of a commemoration to the Choucair family, three generations of whom died in the fire.
John Nolan, who was found with cigarettes and two lighters, suffered burns on 65% of his body after being alight for around six minutes.
Known as Pily she died in January, seven months after the disaster, having suffered a stroke.