The Amy Winehouse movie "Amy" is set to become the third-highest grossing documentary of all time in the UK, and the highest-grossing British documentary of all time at the local box office, apart from concert films.Asif Kapadia's film is at 3.16 million pounds ($4.89 million), and is positioned to overtake the director's 2010 film "Senna," which grossed $4.9 million, in the next day. "Amy," which is distributed in the UK by Altitude Film Distribution, has been in theaters for five weeks.Once "Amy" has passed "Senna" it will have second-placed film "March of the Penguins" ($5.12 million) firmly in its sights. Michael Moore's 2004 film "Fahrenheit 9/11" is the highest-grossing non-concert documentary at the UK box office, having grossed $10.1 million."'Amy' is an extraordinary film that we always felt had the potential to be an unusual success, and so we are delighted to have surpassed the box-office total of 'Senna' to become the third biggest documentary of all time here in the UK," said Hamish Moseley, head of distribution at Altitude Film Distribution."Amy," which premiered at the Cannes Film Festival, is produced by James Gay-Rees.