Sky

The provided news articles do not mention any entity called "Sky". Therefore, it is impossible to provide a description or summary about it based on the given information. The articles discuss YouTube's withdrawal from UK TV audience measurement, potential merger talks between Banijay Group and All3Media, and author Rachel Reid's experience with Parkinson's diagnosis and TV adaptation of her book series. These are separate news items concerning different organizations and individuals within the media and entertainment industry. Without further context or articles specifically mentioning "Sky", no relevant information can be extracted.