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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RMT members staged a protest outside Parliament to mark the anniversary of the first strike one year ago today.
The former mayor of Tower Hamlets, was forced to step down after he was found guilty of a string of corrupt and illegal practices.
The service is the first to be held in the singer's honour since the private funeral held by the family at Highgate Cemetery on March 29.