For part of that time, Werrity handed out business cards falsely billing himself as an adviser to Fox.
Revelations about Werrity's extraordinary access forced Fox to step down Friday, making him the highest-ranking cabinet minister to resign from Britain's ruling coalition.
The scandal has been deeply embarrassing for Prime Minister David Cameron, who said Tuesday that he was "sorry to see" Fox go but remained committed to transparency in government.
The 10-page report by Cabinet Secretary Gus O'Donnell, Britain's highest-ranking civil servant, concluded that some of Fox's meetings with Werrity were inappropriate because they involved government business and that they lent the impression of a conflict of interest.
Of special concern was that Werrity headed a company funded by donors to the Conservative Party, some of whom also gave money to Fox when the Conservatives were the opposition party.
And because of the "frequency, range and extent" of the meetings between the two men in such far-off places as Dubai and Sri Lanka, outsiders could easily assume that Werrity spoke for Fox and the British government, the report said.
There was no evidence that Fox benefited financially from his relationship with Werrity or that national security or foreign policy were ever compromised, the report added.
Fox hailed those findings but acknowledged in a statement "that it was a mistake to allow the distinctions between government and private roles to become blurred, and I must take my share of the responsibility for this."
The emphatic nature of the report, especially its conclusion that Fox ignored warnings from civil servants about his meetings with Werrity, probably shuts the door on a comeback for him as a minister.