"That will need to be paid off at some point," says Quilter Cheviot's Ben Barringer. "Having more debt means you've got more burden, and that means you've got less to spend on content."
Aldi also claims it is the only major supermarket to offer paid breaks to all staff.
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"There is something tactile about it when you hold it," said Dr Sara Machin, the finds lead for Access +, the consortium of archaeologists in charge of this project. "Even now it fits snugly in my hand."
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.