That was 15.4 per cent of all alerts sent to date, since September, and a record high.
There are complaints from businesses across the country that the alerts are causing serious staff shortages and affecting services.
To date there have been 3.94 million alerts sent.
The data – now available at a local authority level – shows the number of alerts increasing in every part of Derbyshire.
To date there have been 3.94 million alerts sent.
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