Britain has said that in the event of a no-deal Brexit scenario, Irish citizens would continue to have the right to enter and remain in the UK.
It comes as the UK publishes a second batch of no-deal Brexit advise papers, which advises businesses and the public about how to cope with the disruption that leaving the EU without a divorce deal would cause.
The papers add that there would be no routine immigration controls on journeys between Ireland and the UK if a withdrawal agreement between the EU and the UK is not agreed.
"With six months to go until the UK leaves the European Union, we are stepping up our ‘no-deal’ preparations so that Britain can continue to flourish, regardless of the outcome of negotiations," Brexit minister Dominic Raab said.
"These technical notices are part and parcel of our sensible, pragmatic approach to preparing for all outcomes."
Mr Raab also said that a no-deal Brexit was unlikely, but that the UK would manage the challenges and eventually flourish.
Last month, Theresa May's government published the first 25 of a total of more than 80 technical notices.
They are intended to give the British public and businesses advice on coping with the possibility of a 'no-deal' Brexit next March.
The first batch of advice papers detailed how tariffs, financial services, state aid and pharmaceuticals would operate if Britain departs without a divorce deal.
The European Union has already produced 68 technical notices of its own.
Mr Rabb has insisted that the UK will not pay its £39 billion "divorce bill" to Brussels if it is refused a Brexit deal.
His comments came after Mrs May made it clear Britain would rethink its agreement to pay the exit settlement in full if it did not achieve an arrangement on future trading relations.
Writing in the Daily Telegraph, Mr Raab stated that if there was no deal "the Government would not pay the terms of the financial settlement".
"There's no deal without the whole deal," he added.
He later told BBC Radio 4 that the warning of the UK not paying all of its £39 billion divorce bill was a "statement of fact", not a threat.
Mr Raab said the government wanted a good agreement, but added: "It will require our EU friends to match the ambition and pragmatism we have demonstrated.
"If that doesn't happen, the UK will manage the challenges of no-deal, so we make a success of Brexit."
The Brexit Secretary also accused people who warned about shortages of food and medicines after a no-deal withdrawal of "scaremongering", saying it was "nonsense" to claim UK supermarkets would run out of food.
Contingency planning for short-term disruption was nothing new, he added.
Meanwhile, a spokesman for the EU has said that the bloc will not reconsider parts of the Brexit agreement that have already been agreed on, such as the divorce bill London will have to pay.
"We will not be revisiting those areas of the withdrawal agreement that are now settled, including the financial settlement," he said.
Additional reporting PA