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Reuters
In preparation for the Brexit case warned by a government crime monitoring agency, organized criminals can take advantage of the gap in UK border preparation.
The National Audit Office said the new border control system could be used to consign fraud or smuggled goods.
When it took two weeks for Britain to leave the EU, it warned government departments and businesses were not fully prepared for the risk.
"Mitigate risk can be out of government control," he warned.
The NAO's report said, "If there are no trades on October 31, 2019, we won't know exactly what will happen at the border, and we can pose a" new challenge "to government departments."
"This includes helping businesses and individuals fulfill their new obligations, mitigating the risk that borders are vulnerable to fraud, smuggling or other criminal activities, and activating civil emergency plans if necessary."
The government spending watchdog said the government has made progress in arranging the systems, infrastructure and resources necessary for border management in the case of Brexit, which has no problem.
Nevertheless, the government could not mitigate the most "significant risk" for the effective functioning of the British border in the absence of transactions.
The biggest risks in border operations include the level of business readiness, controls imposed by EU member states, and interim measures on the Northern Ireland-Irish border, the report said.
HM Revenue & Customs estimates that 150,000 to 250,000 traders will have to file a customs declaration on the first day after Brexit. Among them, only 25,000 have been registered so far, NAO said.
The report also acknowledged in September that actions on the border between Northern Ireland and Ireland are unlikely to continue beyond "short term" due to "significant economic, legal and biosecurity risks." As well as the possibility of "private anxiety".
Despite the government's contingency plan when Britain did not leave the European Union on March 29, the Bureau said some of the plans had not been updated since.
Are you ready for England?
NAO said other plans, systems and infrastructure were "mostly" developed for the first day after Brexit, NAO said. But I was worried that it might not work as planned.
"Preparing the UK border for the EU exit, with or without a transaction, was extremely complex and required a lot of work from third parties such as many government departments, agencies and traders.
Gareth Davies, NAO's governor, said, “Despite their efforts, there are significant risks that can affect the public and businesses.