David Frost, Baron Frost

On 29 January 2021, before he could take up the role full-time, Frost was replaced as UK National Security Adviser by Sir Stephen Lovegrove. Instead, Frost was appointed UK Representative for Brexit and International Policy.

Frost was made a Minister of State at the Cabinet Office on 1 March 2021, and a full member of the cabinet. He was given responsibility for both the domestic and international aftermath of Brexit. He also succeeded Michael Gove as the UK chairman of the EU–UK Partnership Council. His first action, on 3 March, was to exempt British companies from certain regulations when shipping food to Northern Ireland. In June 2021, he wrote an article in the Financial Times calling for the EU to revisit the Northern Ireland Protocol that he had negotiated, saying the "EU needs a new playbook for dealing with neighbours, one that involves pragmatic solutions between friends, not the imposition of one side's rules on the other and legal purism" and noted the government had underestimated the effect of the protocol, even though its implimentation was opposed by the Unionist parties in Northern Ireland and its text clearly created a trade barrier between Northern Ireland and the rest of the UK.

Frost resigned from the government on 18 December 2021, stating that he had "concerns about the current direction of travel" of the government, he had failed to resolve the issues of the Northern Ireland protocol which by then had created political paralysis within the Stormont Government. He cited Boris Johnson's tax hikes, net zero commitments, COVID-19 regulations, and failure to seize the benefits of Brexit as the reason for his resignation. Frost has also called out against "the neo-socialists, green fanatics and pro-woke crowd" in Downing Street under Johnson's premiership. Although Frost has never held any elected positions within Parliament, he has indicated that he would be willing to stand as an MP if the opportunity arose, although this would mean resigning as a member of the House of Lords. As of 2022 he listed his occupation as "peer of the realm".

The trade agreement, negotiated under increasing time pressure due to the end of the transition period on 31 December 2020, had to address all of these issues. Formal trade negotiations, in which Michel Barnier represented the EU and Frost represented the UK, began on 31 March 2020. They were originally due to be concluded by the end of October 2020. However, negotiations continued and formally ended on 24 December 2020 when an agreement, the EU–UK Trade and Cooperation Agreement, was reached in principle after ten negotiating rounds.

On 31 January 2020, Frost was appointed Chief Negotiator of Task Force Europe. On 19 December 2021 he was replaced by Liz Truss, the Foreign Secretary, as the government's chief negotiator with the EU.

On 28 June 2020, Prime Minister Boris Johnson announced his nomination of Frost for a life peerage and as UK National Security Adviser, succeeding Sir Mark Sedwill. The Financial Times reported that this was unpopular with military and security services, who felt Frost was underqualified. The appointment received criticism from former Cabinet Secretary Lord O'Donnell and former National Security Adviser Lord Ricketts due to concerns that the Civil Service's impartiality was being eroded by appointing a special adviser in this role. The appointment was also criticised by previous Prime Minister Theresa May in Parliament, who highlighted its political nature, and said Frost does not have proven expertise in national security.

Created a life peer, titled Baron Frost, of Allenton in the County of Derbyshire, on 12 August 2020, he was introduced to the House of Lords on 8 September 2020.

After Johnson was appointed Prime Minister, Frost was Chief Negotiator for Exiting the European Union from 2019 to 2020 and the Prime Minister's Europe Adviser from 2019 to 2021. He was appointed Chief Negotiator of Task Force Europe in January 2020. He was elevated to the House of Lords as a life peer in September 2020. Frost became Minister of State at the Cabinet Office and a full member of the cabinet in March 2021. He resigned from his government positions in December 2021.

In early 2019, Frost became CEO of the London Chamber of Commerce and Industry. He has also served as a public commentator on the European Union, global economic and commercial issues, and multilateral diplomacy, as a member of the Advisory Council of the eurosceptic think tank Open Europe, and between June and October 2016, through his industry role as head of the Scotch Whisky Association, as a member of the Scottish Government's Standing Council on Europe advising on Brexit.

Frost was the United Kingdom's Chief Negotiator for Exiting the European Union during the Brexit negotiations in 2019 which resulted in the revised Brexit withdrawal agreement. After the UK left the European Union in January 2020, Frost led the UK's negotiations with the EU on a free trade agreement during the Brexit transition period.

After Boris Johnson became Secretary of State for Foreign and Commonwealth Affairs, Frost was appointed in November 2016 as his special adviser, serving until Johnson resigned from office in July 2018.

Frost left HM Diplomatic Service in 2013 to become CEO of the Scotch Whisky Association, a trade association. In 2015, in a hearing before the Scottish Parliament, he argued in favour of the UK's membership of the EU, noting that for a Briton on an average salary, the benefit of the UK being a member of the EU was around £1,500 a year. Frost was admitted as a liveryman of the Distillers' Company in 2016. It was in his capacity as CEO that he wrote an article before the Brexit referendum for Portland Communications, in which he supported the case for remaining in the EU's Single Market and said that leaving it would be "fraught with economic risk".

From May 2006 until October 2008, Frost served as HM Ambassador to Denmark and was appointed Companion of the Order of St Michael and St George in the 2006 Birthday Honours. He was then Director for Strategy and Policy Planning in the Foreign Office from October 2008 to October 2010, before being seconded to the Department for Business, Innovation and Skills where he served three years as Director for Europe, Trade, and International Affairs, HMG's most senior trade policy official.

Frost was promoted Economic Counsellor to the British Embassy, Paris, in 2001, where he was responsible for reporting and lobbying on all aspects of French economic and commercial life, together with its EU policy. He returned to London to be Head of the EU (Internal) Department and then Director for the European Union in the Foreign Office. In this period he led work on a range of economic and social issues, notably the resistance to the initial Working Time Directive, and the negotiation on the EU's multi-annual Budget framework. He was a member of the UK's leadership team during its EU Presidency in 2005.

In 1993 Frost married Jacqueline Elizabeth Dias, divorcing in 2018. He married Harriet Mathews, a former British Ambassador to Somalia, later that year.

Frost joined the Foreign and Commonwealth Office (FCO) in 1987, and shortly after was posted to the British High Commission in Nicosia where he learned Greek and was responsible for covering Greek Cypriot politics and the Cyprus problem. In 1993, he was posted to the UK Representation to the EU in Brussels as First Secretary for Economic and Financial Affairs, where he worked on issues such as the EU Budget, the economic and financial implications of enlargement to Central Europe, and the Euro. He was then posted to the UK Mission to the United Nations in New York, where he covered Human Rights and Social and Economic Affairs.

Frost was born in Derby and was educated at Nottingham High School as a free scholar from 1976 to 1983, before attending St. John's College, Oxford, where he took a first-class degree (MA) in French and history. His studies majored on medieval European history and medieval French.

David George Hamilton Frost, Baron Frost CMG PC (born 21 February 1965) is a British former diplomat, civil servant and politician who briefly served as a Minister of State at the Cabinet Office between March and December 2021. Frost was Chief Negotiator of Task Force Europe from January 2020 until his resignation in December 2021.