Hong Kong’s food safety watchdog has urged people with gluten allergies not to eat a Marks & Spencer yoghurt product after the allergen was found but not declared on the label.The Centre for Food Safety (CFS) said on Monday night it was investigating the omission of gluten from the ingredients list of the supermarket’s authentic vanilla Greek yoghurt product.The affected batch, imported by Alf Retail Hong Kong Limited, is sold in 500g (18oz) packs with a use-by date of May 12.“The CFS noticed...