|"Is this all real? Or has this been happening inside my head?"
The subject of this article is a real-life person, group, company, product, or creative work that has been mentioned "in-universe" in a canon source. The Harry Potter Wiki is written from the perspective that all information presented in canon is true (e.g., Hogwarts really exists), and, as such, details contained in this article may differ from real world facts.
East Anglia, commonly and somewhat incorrectly known as simply Anglia, is a region of England, comprising of the counties of Norfolk, Suffolk and Cambridgeshire. A regional edition of the Muggle entertainment magazine Radio Times was printed for the areas of London, Anglia and the Midlands, and thus the Granger family, who subscribed to this version of the magazine, may have lived in one of these three areas.