In October 1986, partly due to pressure from Cockton's mother and the anti-war politician Tam Dalyell, an official board of inquiry was finally opened.[19][20][21][22][23][24] The board took a month to reach the conclusion that XX377 was shot down by Cardiff.[2] Historian Hugh Bicheno remarks: "It took [the] MoD four years and two investigations, the first either incompetent or a deliberate cover-up, even to admit the Gazelle blue-on-blue."[25] The board's findings were made public by a Freedom of Information Act request in July 2008, although Paragraph 13 of the report was redacted under Section 26 of the act as it "contains operational details of the Royal Navy's activities, which, even with the passage of time since the Falklands campaign, would be of use to potential enemies."[26]