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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Industrial vacuum cleaners and magnetic wands will be used each night during the summer to remove metal particles, dust, oil and grease.
Detective Superintendent Fiona McCormack said the Hotpoint FF175BP model had not been subject to any product recall.
Security for this year's event on July 8 has been reviewed following a spate of terror attacks in the capital.