WH Smith shares tumble after accounting blunder

WH Smith's shares plummet 38% due to North America accounting error, cutting profit forecasts for the region by £30 million. The company's annual pre-tax profits outlook is now around £110 million following the mistake, leading to a review by Deloitte. Analysts express concerns over the impact on WH Smith's growth plans and investor sentiment, calling the error a "disaster" that may lead to further issues for the company.