British and Irish citizens will continue to have the right to move freely, as they have since 1923.
Even if there are no checks, goods will be subject to WTO tariffs. At the moment that equates to about 11p a litre on milk, which will destroy many dairy farmers.
You can't be sure of anything, Davidhs. It's not just the EU which will want to control the flow of goods, but the UK too. You cannot say that the situation will be the same as the Swiss border, because Switzerland has a deal with the EU. The UK won't have a deal with the EU and needs to negotiate - that's the whole point! Deals such as one needed in Ireland can't be concluded within a couple of weeks.
Johnson hasn't come up with anything!