By Steve Hatch Yougov’s chief executive Steve Hatch takes a closer look at the data behind the biggest stories in business. After dropping its “Never Knowingly Undersold” pledge in February 2022 on thegrounds that it lacked “relevance” amid competition from Amazon and other e-commerce retailers, John Lewis announced that it was bringing the slogan back on 5September. There may be an obvious enough logic to the retailer resurrecting its old tagline inthese budget-conscious times. But has it had an impact on consumer opinion?YouGov BrandIndex data shows that Buzz scores – which measure whether t…