WH Smith shares tumble after accounting blunder

Emer MoreauBusiness reporter, BBC NewsGetty ImagesThe WH Smith name is only seen in airports in the UK nowWH Smith shares slumped 38% on Thursday morning following an accounting error which led it to overstate its North America profits.The company has cut its profit forecasts in the region as a result and has ordered a review by auditors.The firm said the mistake was because of an issue in how it calculated the…