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Following the most recent cuts, Tesco said it was consulting on the proposals with the trade union Usdaw.
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Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
Xbox fans have been left divided after Microsoft announced Phil Spencer, boss of its gaming division, and Xbox president Sarah Bond would step down from their roles.