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theo leggett, has this report. empty supermarket shelves. pictures like these revive memories of panic buying and shortages seen at the start of the pandemic and prompted the government to take action. the food industry, like other parts of the economy, has been suffering from a lack of staff because too many workers are isolating at home. here s the problem. if you are contacted by test and trace or pinged by the app, you re meant to self isolate for ten days. but as infection rates rise, too many people are absent from work. so starting today, the government says it will allow workers at some 500 key sites to avoid isolation if they get pinged, provided they take covid tests for seven days. we re talking principally here, supermarket depots, distribution centres, where all of the work happens to get food out to those supermarkets. it doesn t include stores itself, because that would be a big departure from the approach we have now but certainly this is going to go a very long way to getting the food supply chain working properly. the response from food retailers