With Marks & Spencer scrapping 'use by' dates on its milk to prevent it being thrown away too quickly, more people are thinking about the best way to store it. The supermarket will now label its pints with 'best before' dates instead (relating to its quality), encouraging shoppers to use their own judgement about its safety. This follows Morrisons doing the same last year, meaning the old-fashioned 'sniff test', really is on the rise again.