Foreign Office staff have been banned from saying “no-deal Brexit” as Boris Johnson steps up his drive to convince the public the argument is over.

A directive reads: “On 31 December 2020 we will either leave the transition period with a Canada-style free trade agreement or the ‘2019 deal’ which will give us a trading relationship with the EU like Australia’s”.

Staff were then told: “Do not use phrases such as ‘deal/no deal’.”

The instruction comes despite Australia lacking a trade deal with Brussels, which means a similar “trading relationship” will mean tariffs and other barriers.

The rebranding is widely seen as softening up the public for the UK being forced onto vastly-inferior World Trade Organisation terms in 2021, with the threat of an economic slump.

Peter Ricketts, the former top civil servant at the Foreign Office, mocked the memo, tweeting: “We have been warned.”

It emerged at the weekend that a no-deal Brexit had been rebranded as an ‘Australia-style’ arrangement – and the prime minister then argued the word Brexit should no longer be used.

Foreign Office staff have also been told not to use other Brexit-related phrases including “implementation period” and “special partnership”, The Guardian revealed.

The opening sentence says: “Brexit is completed. So do not use the term ‘Brexit’ save as a historical event that took place on 31 January 2020.”

Brexit day: UK says goodbye to EU Show all 66 1 /66 Brexit day: UK says goodbye to EU Brexit day: UK says goodbye to EU A message projected onto the White Cliffs of Dover Sky News/AFP via Getty Brexit day: UK says goodbye to EU LONDON, ENGLAND - JANUARY 31: Pro Brexit supporters attend the Brexit Day Celebration Party hosted by Leave Means Leave at Parliament Square on January 31, 2020 in London, England. At 11.00pm on Friday 31st January the UK and Northern Ireland exits the European Union, 188 weeks after the referendum on June 23rd, 2016. (Photo by Jeff J Mitchell/Getty Images) Jeff J Mitchell Getty Brexit day: UK says goodbye to EU Big Ben, shows the hands at eleven o'clock at night AFP via Getty Images Brexit day: UK says goodbye to EU Nigel Farage speaks to pro-Brexit supporters PA Brexit day: UK says goodbye to EU Pro-Brexit demonstrators celebrate on Parliament Square REUTERS Brexit day: UK says goodbye to EU The Union flag is taken down outside the European Parliament in Brussels PA Brexit day: UK says goodbye to EU Pro-EU campaigners outside the Scottish Parliament, Edinburgh PA Brexit day: UK says goodbye to EU A pro-Brexit supporter jumps on an EU flag in Parliament Square PA Brexit day: UK says goodbye to EU EU Council staff removed the Union Jack-British flag from the European Council in Brussels, Belgium EPA Brexit day: UK says goodbye to EU A pro-Brexit supporter pours beer onto an EU flag PA Brexit day: UK says goodbye to EU Pedestrians pass in front of the Ministry of Defence Building on Whitehall, illuminated by red, white and blue lights in central London AFP via Getty Images Brexit day: UK says goodbye to EU A Brexit supporter shouts during a rally in London AP Brexit day: UK says goodbye to EU Pro-EU campaigners outside the Scottish Parliament, Edinburgh PA Brexit day: UK says goodbye to EU Pro-EU campaigners take part in a 'Missing EU Already' rally outside the Scottish Parliament, Edinburgh PA Brexit day: UK says goodbye to EU A large pro-EU banner is projected onto Ramsgate cliff in Kent PA Brexit day: UK says goodbye to EU Pro-EU supporters light candles in Smith Square in Westminster PA Brexit day: UK says goodbye to EU A man waves Union flags from a small car as he drives past Brexit supporters gathering in Parliament Square AFP via Getty Images Brexit day: UK says goodbye to EU The five-year old Elisa Saemann, left, and her seven-year old sister Katie hold a placard during a rally by anti-Brexit protesters outside the Scottish parliament in Edinburgh AP Brexit day: UK says goodbye to EU Pro Europe supporters gather on Brexit day near the British embassy in Berlin, Germany EPA Brexit day: UK says goodbye to EU Anti-Brexit protester hugs a man while holding a placard REUTERS Brexit day: UK says goodbye to EU A decorated, old fashioned fire pump in Parliament Square PA Brexit day: UK says goodbye to EU Pro Brexit Elvis impersonator performs at Parliament Square Getty Images Brexit day: UK says goodbye to EU An anti-Brexiteers stands with his dog in Parliament Square AFP via Getty Images Brexit day: UK says goodbye to EU Paddy from Bournemouth wears Union colours as he sits next to an EU flag decorated bag in Parliament Square AFP via Getty Images Brexit day: UK says goodbye to EU A pro-EU activist plays a guitar decorated with the EU flag during a protest organised by civil rights group New Europeans outside Europe House, central London AFP via Getty Images Brexit day: UK says goodbye to EU People celebrate Britain leaving the EU REUTERS Brexit day: UK says goodbye to EU A Pro Brexit supporter has a Union Jack painted onto his face at Parliament Square Getty Images Brexit day: UK says goodbye to EU Men hold placards celebrating Britain leaving the EU REUTERS Brexit day: UK says goodbye to EU Pro Brexit supporters dance in the street draped with Union Jack flags at Parliament Square Getty Images Brexit day: UK says goodbye to EU An anti-Brexit demonstrator spreads his wings during a gathering near Downing Street AP Brexit day: UK says goodbye to EU Pro EU supporters display a banner ' Here to Stay, Here to Fight, Migrants In, Tories Out' from Westminster bridge EPA Brexit day: UK says goodbye to EU Pro-Brexit supporters burn European Union flags at Parliament Square Getty Brexit day: UK says goodbye to EU A man poses for a picture on Parliament Square in a 'Brexit Day' t-shirt Reuters Brexit day: UK says goodbye to EU People celebrate Britain leaving the EU Reuters Brexit day: UK says goodbye to EU A pro-EU anti-Brexit protester holds up a placard showing Britain's Prime Minister Boris Johnson and US businesswoman Jennifer Arcuri in Parliament Square in central London on January 31, 2020 on the day that the UK formally leaves the European Union. - Britain on January 31 ends almost half a century of integration with its closest neighbours and leaves the European Union, starting a new -- but still uncertain -- chapter in its long history. (Photo by Glyn KIRK / AFP) (Photo by GLYN KIRK/AFP via Getty Images) GLYN KIRK AFP via Getty Brexit day: UK says goodbye to EU A man wears a pro-Brexit t-shirt Reuters Brexit day: UK says goodbye to EU Anti-Brexit demonstrators visit Europe House to give flowers to the staff on Brexit day Reuters Brexit day: UK says goodbye to EU Pro Brexit supporter wears a novelty Union Jack top hat outside the Houses of Parliament Getty Images Brexit day: UK says goodbye to EU Customers Scott Jones and Laura Jones at the Sawmill Bar in South Elmsall, Yorkshire, where a Brexit party is being held throughout the day PA Brexit day: UK says goodbye to EU A pro-Brexit demonstrator clenches his fist during a rally in London, Friday, Jan. 31, 2020. Britain officially leaves the European Union on Friday after a debilitating political period that has bitterly divided the nation since the 2016 Brexit referendum. (AP Photo/Alberto Pezzali) Alberto Pezzali AP Brexit day: UK says goodbye to EU LONDON, ENGLAND - JANUARY 31: Pro-EU activists protest at Parliament Square as people prepare for Brexit on January 31, 2020 in London, United Kingdom. At 11.00pm on Friday 31st January the UK and Northern Ireland will exit the European Union 188 weeks after the referendum on June 23rd 2016. (Photo by Jeff J Mitchell/Getty Images) Jeff J Mitchell Getty Brexit day: UK says goodbye to EU LONDON, ENGLAND - JANUARY 31: Pro Brexit supporters hold up placards at Parliament Square as people prepare for Brexit on January 31, 2020 in London, United Kingdom. At 11.00pm on Friday 31st January the UK and Northern Ireland will exit the European Union 188 weeks after the referendum on June 23rd 2016. (Photo by Jeff J Mitchell/Getty Images) Jeff J Mitchell Getty Images Brexit day: UK says goodbye to EU Pro-EU activists protest Getty Images Brexit day: UK says goodbye to EU A pro-Brexit demonstrator burns a European Union flag AP Brexit day: UK says goodbye to EU Pro Brexit supporters Getty Images Brexit day: UK says goodbye to EU Pro Brexit supporters Getty Images Brexit day: UK says goodbye to EU A Brexit supports holds a sign in Parliament Square AP Brexit day: UK says goodbye to EU A man carries an EU themed wreath Reuters Brexit day: UK says goodbye to EU Ann Widdecombe reacts with other members of the Brexit party as they leave en masse from the European Parliament PA Brexit day: UK says goodbye to EU Anti-Brexit demonstrators in Parliament Square PA Brexit day: UK says goodbye to EU Pro EU supporters let off flares from Westminster Bridge Getty Brexit day: UK says goodbye to EU British MEPs Jonathan Bullock, holding the Union Jack flag and Jake Pugh leave the European Parliament, in Brussels on the Brexit day AFP via Getty Brexit day: UK says goodbye to EU Newspapers and other souvenirs at a store, near Parliament Square Reuters Brexit day: UK says goodbye to EU Brexit supporters hold signs in Parliament Square AP Brexit day: UK says goodbye to EU Pro-EU protesters hold placards in Parliament Square AFP via Getty Brexit day: UK says goodbye to EU French newspapers PA Brexit day: UK says goodbye to EU Sinn Fein leader Mary Lou McDonald with a Border Communities Against Brexit poster before its unveiling in Carrickcarnon on the Irish border PA Brexit day: UK says goodbye to EU National growers organisation British Apples & Pears has renamed a British apple to EOS, the Greek goddess of dawn, to commemorate Brexit day AP Brexit day: UK says goodbye to EU Pro-EU protesters hold placards in Parliament Square AFP via Getty Brexit day: UK says goodbye to EU Britain's departure from the European Union was set in law on January 29, amid emotional scenes, as the bloc's parliament voted to ratify the divorce papers. After half a century of membership and three years of tense withdrawal talks, the UK will leave the EU at midnight Brussels time (23.00 GMT) on January 31 Reuters Brexit day: UK says goodbye to EU A man poses with paintings on Parliament Square Reuters Brexit day: UK says goodbye to EU People sporting Union Flags gather in Parliament Square Getty Brexit day: UK says goodbye to EU A man walks with a St. George's flag at Westminster bridge on Brexit day Reuters Brexit day: UK says goodbye to EU A British bulldog toy and other souvenirs at a souvenir store Reuters Brexit day: UK says goodbye to EU British pro-brexit Members of the European Parliament leave the EU Parliament for the last time Reuters Brexit day: UK says goodbye to EU Jonathan Bullock waves the Union Jack as he leaves the European Parliament EPA

It then advises use 'transition period' not 'implementation period' – the latter being the phrase used by Theresa May, despite the lack of anything to implement.

Other words frowned upon include “ambitious”, “unique”, “deep”, “bespoke” or “anything else that can be taken to mean anything other than a typical free trade agreement of the Canada type”.

The guidance adds: “If hyperbole is absolutely essential, only make reference to a deal “at least as good as [Canada’s deal with the EU]”.

With the passing of the withdrawal agreement – securing EU citizens’ rights and avoiding a hard border in Ireland, by shifting the customs border to the Irish Sea – two of the original threats from a no-deal have been averted.

However, the term must mostly understood to mean the risk of crashing out of the EU without a trade deal, where the threat remains.

Instead of ‘partnership, the memo instructs staff to “stick to the phrase ‘friendly cooperation between sovereign equals’.”

Some EU terms must also be avoided, the memo saying: “Use ‘subsidies’, not ‘state aid’” – with “level playing field” also outlawed.