Boris Johnson's government has released its "Operation Yellowhammer" planning document, which warns of medicine shortages, severe delays at the Dover-Calais crossing and an increase in food prices if the United Kingdom leaves the European Union without a deal.
But Michael Gove, the minister in charge of no-deal planning, said the government would not release internal communications between aides about Johnson's prorogation of Parliament, which was also mandated in the bill passed by Parliament.
As previously reported when the documents were leaked to the Sunday Times, the report says Gibraltar has failed to invest in contingency infrastructure, has not passed all the necessary legislation, and has planned for less "significant" delays at the frontier than the United Kingdom predicts.
- The document says United Kingdom citizens travelling to and from the European Union "may be subject to increased immigration checks at European Union border posts" causing delays.
"Certain types of fresh food supply will decrease", and "critical dependencies for the food supply chain may be in short supply", the document also says.
It adds: "There is a risk that panic buying will cause or exacerbate food supply disruption".
The report further warns that "protests and counter-protests will take place across the United Kingdom and may absorb significant amounts of police resource".
Meanwhile in Brussels, EU chief Brexit negotiator Michel Barnier said there was "no reason to be optimistic" about striking any divorce deal with Britain before a crucial October 17-18 EU summit. But many lawmakers, economists and businesses fear a no-deal Brexit would be economically devastating and are fighting him every step of the way.
"It is unprecedented", said MP Dominic Grieve, who was expelled from the ruling Conservatives last week for voting against the government over the issue. Johnson says he wants an urgent general election to resolve the impasse. It also said a no-deal exit could trigger major protests and even riots.
MPs forced the United Kingdom government to release the Yellowhammer document before Parliament was suspended - on Tuesday.
It said the flow of traffic across the English channel could be reduced by as much as 60% on the first day after a no-deal Brexit.
He added: "And while the document is identical to the leaked version over a month ago, the government has appeared to have changed the title from a base case scenario to "reasonable worst-case".
Cross-border financial services would be affected as would information-sharing between police and security services, according to the document. But he refused to make public the advice of government advisers about Johnson's decision to prorogue, or suspend, parliament from Monday until 14 October.
However, one of Boris Johnson's most senior cabinet colleagues said that ministers were ultimately responsible and accountable for actions parliament take, so, therefore, it is "inappropriate in principle and in practice, would on its own terms purport to require the government to contravene the law, and is singularly unfair to the named individuals" to release those communications.
Last week, the High Court in London said the decision was inherently political and "not a matter for the courts".
The UK Supreme Court is set to consider next week whether the shutdown should be reversed, after conflicting rulings in lower courts.