Anthony Lewis,Local Democracy Reporting Service
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Number (4): Everything in this space must add up to 4. The answer is 5-3, placed vertically; 1-1, placed horizontally.
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."