This is what we found on Wikipedia regarding the The Devil Wears Prada (London):

The Devil Wears Prada is a 2006 American comedy-drama film directed by David Frankel and produced by Wendy Finerman. The screenplay, written by Aline Brosh McKenna, is based on the 2003 novel by Lauren Weisberger. The film stars Meryl Streep, Anne Hathaway, Stanley Tucci, and Emily Blunt. It follows an aspiring journalist who gets a job at a fashion magazine, but finds herself at the mercy of her demanding editor.

In 2003, 20th Century Fox bought the rights to a film adaptation of Weisberger's novel before it was completed for publication; the project was not greenlit until Streep was cast in the lead role. Principal photography lasted 57 days, primarily taking place in New York City from October to December 2005. Additional filming was done in Paris, France.

After premiering at the LA Film Festival on June 22, 2006, The Devil Wears Prada was theatrically released in the United States on June 30. The film received positive reviews from critics, with Streep's performance receiving widespread critical acclaim, thus earning her numerous awards and nominations, including the Golden Globe Award for Best Actress – Motion Picture Comedy or Musical and nominations for the Academy Award for Best Actress and the Screen Actors Guild Award for Outstanding Performance by a Female Actor in a Leading Role. Hathaway and Blunt also drew favorable reviews and various nominations for their performances. The film grossed over $326 million worldwide, against its $41 million budget, and was the 12th highest-grossing film worldwide in 2006.

Although the film is set in the fashion world, and references well-known establishments and people within that industry, most designers and other fashion notables avoided appearing as themselves for fear of displeasing US Vogue editor Anna Wintour, who is widely believed to have been the inspiration for Priestly. Wintour later overcame her initial skepticism, saying she liked the film and Streep's performance in particular.