McDonald's, KFC, Burger King and Subway big rule changes from May 17 New rules customers need to know about from tomorrow 15:34, 16 MAY 2021 Updated The video will auto-play soon8Cancel Play now Customers will be allowed back inside fast food restaurants from tomorrow at long last. Most of our favourite chains have been open for takeaway, but May 17 marks the first time customers can sit and enjoy their meal indoors. However, nearly all restaurants have introduced new rules that customers and staff will be asked to follow when inside. McDonald's, Subway, KFC and more have set out their new guidelines to keep people safe.