If you have a business and need to do business with the EU. Here is one way you can ensure this can happen, legally. And it should not stop there, resources for any skilled British person to survive in the EU to attract both EU citizens and those who are completely resistant to the very idea of Brexit Britain: the racism and violence toward our fellow human beings, hatred just because they were born on another piece of land is intolerable.
So this creates a market to demand the skills of the sane British. This means it is only logical that UK companies open online companies in the EU, Estonia will host them, apparently. Read the link above.
Note: I am not recommending this service, just reporting that it exists. I do hope it is the start of a process including freedom of movement for British European Remainers.