* Work at The Telegraph Four day working week would boost productivity and happiness, Oxford Office workers Researcher told BBC - gains from improved productivity * Happiness A four-day working week would boost productivity, a study by Oxford BBC, suggesting it is potentially the ultimate virtuous working circle to improve work-life balance. that would see workers enjoy a three-day weekend, but get paid the same as a five-day working week, by companies passing on efficiency savings * Happiness 3. Britain's Work and Pensions Secretary Amber Rudd leaves 10 Downing