About 80 technical notices were published by the government this autumn in preparation for a no-deal Brexit, with the first 25 covering everything from ports to business paperwork and pharmaceuticals.

Here are some of the big issues the notices do and do not address, and what business leaders have said in response.

Northern Ireland

Despite repeated requests, the government has not published a no-deal planning paper on Northern Ireland.

British citizens’ rights in the EU

The 1 million British nationals settled in the EU would not have their rights protected, including their right to work, live or trade in the country in which they have settled.

EU citizens in the UK

Although Theresa May has given assurances that EU citizens settled in the UK before 29 March would continue to have the right to live and work in the country, some of their rights would disappear including all in-perpetuity family reunion rights. These, for example, allow elderly parents to come to Britain in future to live with their EU-national children.

Flights

Flights could be disrupted between the UK and the rest of the EU, although the Department for Transport has said it expects to get a bare bones deal and does not expect planes to be grounded en route to the continent. The EU plans to publish a bare bones deal to keep roads and airports moving.

Ports and roads

Kent county council recently said a no-deal Brexit would cause major disruption on the roads around Dover and lead to rubbish not being collected, children being unable to take exams, health workers not being able to get to work and lorry queues affecting traffic up and down the country. Kent says the government needs to put in place ambitious no-deal supports including police and resources to prevent gridlock. The government has said it will put 3,500 troops on standby to help keep the country moving.

Business disruption

James Stewart, the head of Brexit at the accountancy firm KPMG, says businesses will have to think of the basics: currency hedges, inventory, supply chain risks in the event of gridlock, warehousing capacity and the possibility that EU citizens may not return to work after March. Exporters will have to assess the origin of their product: is it “made in Britain” or “made by a continent” – ie involving parts from multiple countries – and will it attract a hefty tariff in a no-deal scenario.

Business paperwork

Companies trading with the EU say they face a tangle of red tape, possible border delays and more costly credit card payments if there is no deal.

Food shortages

Many players have warned of potential food shortages, particularly of perishable foods that come from southern Europe during winter months such as tomatoes, lettuce, cucumbers and fruit. Chilled and frozen foods warehousing, storing everything from garden peas to half-baked supermarket bread, are already fully booked for the next six months.

Travel to the EU

Visitors from post-Brexit Britain would have to fill out an online form and pay €7 (£6) for a visa waiver, which would be valid for three years.

Pets abroad

Pet owners – those with dogs, cats or ferrets – who want to take them on holiday in the EU would have to start preparing at least four months in advance of the date they wish to travel. Owners would need to prove their animals are vaccinated against rabies, requiring a special test, and then obtain a health certificate.

Phones

Roaming charges would apply in the event of no deal, raising the prospect of a return to huge bills for holidaymakers and business travellers. The government says it will cap the charge for roaming at £45 a month and will legislate to ensure customers continue to receive alerts for data roaming.

Driving (private)

Some European countries may stop recognising UK driving licences, and motorists may be required to obtain an international driving permit. UK motorists would need to carry an international certificate of insurance issued by insurance providers, known as a green card, as proof of third-party motor insurance cover.

Driving (commercial)

Commercial drivers face a nightmare with about 1,000 permits allocated to the UK and 60 to Northern Ireland to allow entry into the EU.

Bus and coach services

Bus and coach services to the EU could be suspended under a no-deal Brexit, one of the papers says, as the EU may no longer recognise UK-issued community licences, which give carriers access to international journeys “for hire or reward”.

Hauliers

Livestock hauliers face more red tape, with certificates of competence, vehicle approval certificates and valid transporter authorisation documents required for transit to the EU.

Mineral water

British mineral waters would not be accepted for sale in the EU in the event of no deal.