Fire broke out in an 18-storey tower block in February 1990, causing frightened neighbours to flee their homes.
Eight people were evacuated from flats on the ninth and tenth floors of Citizen House in the Harvest Estate.
Firefighters broke into three other flats to check no one was inside. But the Brigade managed to stop the fire spreading from its source - a ninth floor electrical cupboard.
Police had been called to the same cupboard the previous day evict a man who was rough sleeping there.
Angry neighbours were left without heating and lights for 24-hours following the fire.
An Islington Council spokesperson said: "The fire had to be put out with hoses so we had o wait for everything to dry out before supplies could be re-connected."
Elsewhere, a family of four were rescued by firefighters from their blazing flat above a grocery store in Canonbury Street.
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