In a lengthy article published in a US academic journal, the former career diplomat excoriated the UK government for downplaying the cost and impact of Brexit in “public talking points” aimed at presenting the official British government line in Washington.

“They downplayed the increased friction that was likely for businesses trading between the United Kingdom and the EU countries as well as third countries such as the United States, ” wrote Ms. Hall Hall in the Texas National Security Review journal.

“But, most damagingly, the talking points also downplayed the consequences of Brexit for the delicate peace process in Northern Ireland, in which the United States was a core stakeholder, having helped to broker the Good Friday agreement and supported it since then,” she wrote.

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Ms. Hall Hall wrote that one colleague at the UK embassy in Washington working on Northern Ireland was “nearly in tears” as he “could not get his minister to register the enormous damage that would be done to the fabric of Northern Ireland, politically and economically, if the United Kingdom left the European Union without a deal.”

“A low point for me was when I heard a senior British minister openly and offensively, in front of a US audience, dismiss the impact of a “no-deal” Brexit on Irish businesses as just affecting ‘a few farmers with turnips in the back of their trucks,” she wrote.

The former diplomat said that when she was asked to brief American businesses with significant investments in the UK, she struggled to maintain the line that there would be “no harmful consequences” for them if the UK left the EU without a deal.

“I found it hard to brush aside the concerns of congressional aides working for members of the Irish-American caucus,” she wrote.

“Sometimes I had no answers to the questions that US stakeholders posed to me. The internal dissonance became acute: the professional ethos of the British Diplomatic Service was that we were upstanding civil servants, steeped in integrity, who never told lies.

“And yet, that was precisely what I was being asked to do.”

Ms.Hall Hall, a former British ambassador to Georgia, was Britain’s Brexit counselor in the US from 2018 to December 2019 when she resigned.

She said she stepped down because she was asked to convey messages that were “neither fully honest nor politically impartial” to US representatives and politicians.

In her resignation letter published at the time, she said that her position had become “unbearable personally” and “untenable professionally.”