<P> Locations in England included the River Thames, for the flight of the Order of the Phoenix to Number Twelve, Grimmauld Place, and the flight of Dumbledore's Army to the Ministry of Magic . This sequence also includes such landmarks as the London Eye, Canary Wharf, Big Ben, Buckingham Palace, and the HMS Belfast . Filming at Platform 93⁄4 took place at King's Cross Station, as it has in the past . A telephone booth near Scotland Yard was used as Harry and Arthur Weasley enter the Ministry, while the crew closed the Westminster tube station on 22 October 2006 to allow for filming of Arthur Weasley accompanying Harry to his trial at the Ministry of Magic . Other scenes were filmed in and around Oxford, specifically at nearby Blenheim Palace in Woodstock . </P> <P> In Glenfinnan, the Hogwarts Express crosses a viaduct, as it has in the past films . Aerial scenes were shot in Glen Coe, in Clachaig Gully, and Glen Etive, which, at the time of filming, was one of the few places in Scotland without snow, making it ideal for a backdrop . </P> <P> Director David Yates stated in an interview that he had originally shot a three - hour film of Order of the Phoenix . However, some material had to be cut out in the final edit, as the movie was 45 minutes too long . Therefore, several locations which were used for various scenes do not appear in the final cut of the film . In Virginia Water, scenes were shot where Professor McGonagall recovers from Stunning Spells, and Burnham Beeches was used for filming the scene where Hagrid introduces his fifth - year Care of Magical Creatures class to Thestrals . Harry skips stones in front of the Glenfinnan Monument in Glenfinnan in another cut scene . </P> <P> The film required over 1,400 visual effects shots, and the London - based company Double Negative created more than 950 of them . Working for six months on previsualisation starting in September 2005, Double Negative was largely responsible for sequences in the Room of Requirement, the Forbidden Forest, the Hall of Prophecies, and the Death Chamber . </P>

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