The previous record holder was Harry Potter and the Philosopher’s Stone, released in 2001. This is reported by GamesIndustry.biz with a link to the GfK data.
Also, sales of Hogwarts Legacy for the debut week were 80% higher than at the time of the Elden Ring.
82% of Hogwarts Legacy’s physical sales in the UK came from the PS5, the remaining 18% from the Xbox Series.