You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Spectre_(2015_film)

Context:
In the United Kingdom, the film grossed £4.1 million ($6.4 million) from its Monday preview screenings. It grossed £6.3 million ($9.2 million) on its opening day and then £5.7 million ($8.8 million) on Wednesday, setting UK records for both days. In the film's first seven days it grossed £41.7 million ($63.8 million), breaking the UK record for highest first-week opening, set by Harry Potter and the Prisoner of Azkaban's £23.88 million ($36.9 million) in 2004. Its Friday–Saturday gross was £20.4 million ($31.2 million) compared to Skyfall's £20.1 million ($31 million). The film also broke the record for the best per-screen opening average with $110,000, a record previously held by The Dark Knight with $100,200. It has grossed a total of $136.3 million there. In the U.K., it surpassed Avatar to become the country's highest-grossing IMAX release ever with $10.09 million.

Question:
What film previously held the UK record for highest first week opening gross?

Harry Potter and the Prisoner of Azkaban