https://www.reuters.com/article/us-deliveroo-m-a-amazon/uk-watchdog-affirms-provisional-blessing-for-amazons-deliveroo-deal-idUSKBN23V1YC >Britain's competition regulator has affirmed its provisional clearance of Amazon's purchase of a 16% stake in online delivery group Deliveroo but changed the basis of its approval, having reviewed submissions from interested parties, including rivals.