LONDON (Reuters) - A British supermarket checkout worker's refusal to serve a customer who was talking on her mobile phone has prompted a lively debate about modern etiquette that reached the highest level of the British government on Thursday. The customer complained to Sainsbury's supermarket, which apologized. But the checkout worker has enjoyed an outpouring of support on social media, in the press, and from Deputy Prime Minister Nick Clegg who declared a "sneaking sympathy" for her. ...

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