Newly disclosed documents reveal that the Foreign Office cautioned against British military intervention to overthrow the former Zimbabwean president, the long-serving leader, in 2004, advising it was not considered a "serious option".
Policy papers from Tony Blair's government show officials considered options on how best to deal with the "depressingly healthy" 80-year-old leader, who refused to step down as the country fell into turmoil and financial collapse.
Following Mugabe's Zanu-PF party winning a 2005 election, and a year after the UK participated in a US-led coalition to oust Iraqi leader Saddam Hussein, No 10 asked the Foreign Office in July 2004 to develop potential courses of action.
Diplomats concluded that the UK's strategy to isolate Mugabe and forging an international consensus for change was not working, having not managed to secure support from key African nations, notably the then South African president, the South African leader.
Options outlined in the files were:
"We know from conflicts abroad that changing a government and/or its harmful policies is almost impossible from the outside."
The FCO paper dismissed military action as not a "realistic option," and warned that "The only candidate for leading such a military operation is the UK. No one else (even the US) would be prepared to do so".
It cautioned that military intervention would result in significant losses and have "serious consequences" for British people in Zimbabwe.
"Short of a severe human and political catastrophe – resulting in widespread bloodshed, large-scale refugee flows, and regional instability – we assess that no nation in Africa would support any attempts to remove Mugabe by force."
The paper continues: "Nor do we judge that any other European, Commonwealth or western partner (including the US) would authorise or participate in military intervention. And there would be no legal grounds for doing so, without an authorising Security Council Resolution, which we would fail to obtain."
The Prime Minister's advisor, a senior official, warned him that Zimbabwe "could become a real spoiler" to his plan to use the UK's leadership of the G8 to make 2005 "the year of Africa". Lee concluded that as military action had been discounted, "we probably have to accept that we must adopt a long-term strategy" and re-open talks with Mugabe.
Blair seemed to concur, writing: "We should work out a way of revealing the falsehoods and misconduct of Mugabe and Zanu-PF up to this election and then subsequently, we could attempt to restart dialogue on the basis of a firm agreement."
The then outgoing ambassador, in his final diplomatic dispatch, had recommended critical re-engagement with Mugabe, though he recognized the Prime Minister "would likely be appalled given all that Mugabe has uttered and perpetrated".
The Zimbabwean leader was finally deposed in a 2017 coup, at the age of 93. Earlier assertions that in the early 2000s Blair had tried to pressurise Thabo Mbeki into joining a military coalition to overthrow Mugabe were strongly denied by the ex-British leader.
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