Tesco get website update wrong

Unlike most large retailers Tesco seems to have made a bit of a slip up here. I can’t understand why pushing some updates out to a site as large and as profitable as the Tesco food store can’t be done without downtime. Surely they have a development environment to test on… They did try and promote the other Tesco websites in what appears to be as well produced as Tesco Value Baked Beans!