Avatar became the highest-grossing film of all time in January
James Cameron's sci-fi epic Avatar has broken the UK record for the biggest opening-day sales of a Blu-ray disc.
The film sold 222,824 copies on Monday, selling more in one day than previous record-holder The Dark Knight sold in its first week.
On the same day, it was revealed that Avatar had become the fastest-selling North American DVD and Blu-ray release, shifting 6.7m copies in four days.
It was released on Thursday in the US and Canada to coincide with Earth Day.
Studio 20th Century Fox said it chose the release date to chime with Avatar's environmental theme.
In January, Avatar became the highest-grossing movie of all time, overtaking the $1.843bn (£1.19bn) taken by Cameron's 1997 movie Titanic.