The tests used in standards for evaluating smoke alarms were developed back in the 1980s. However, despite changes in building materials since then, smoke alarms remain reliable, says Chagger: "They still respond to all the main fires we get today."
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"I have to walk two hours a day to come into town to get food," he says, preferring to find shelter outside of the city centre where he feels safer, sleeping in a one-man tent under a bridge.
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