As I may or may not have mentioned I was in 2018 elected to regional council on the Green party ticket and from there to the county hospital board. Among other things, I have been making it a priority to ask questions about Brexit preparedness and apparently now it is clear how to stay in Sweden if you are a UK citizen:

Resi­dence status for British citi­zens

In order for you to be able to continue living in Sweden after the transition period, you must:

  *  be a British citizen, current family member of a British citizen, or former family member of a British citizen
  *  have been in Sweden in accordance with European Union law before the end of the transition period
  *  continue to live in Sweden after the end of the transition period and also continue to meet the requirements for the right of residence, meaning as an employee, sole proprietor, student, person with adequate funds or a family member of a person who meets these conditions
  *  apply for residence status or permanent residence status before the end of the application period on 30 September 2021.

Notice how this isn't dependent at all on any new deal, so in regards to people Sweden has the rules and legislation in place to handle a no-deal, indeed the planning is based on no-deal. The same is true since a year and a half - at least for our counties hospitals - when it comes to medicine and other equipment.

I would guess the same is true elsewhere, everyone should by now done their no deal Brexit preparations, which means it doesn't really matter for hospitals, and businesses etc if there is a no deal Brexit. Of course for countries bordering the UK the situation isn't the same but for the rest of the EU I suspect forcing everyone to plan for a no deal Brexit has made a no deal Brexit a default assumption in planning. And thus no threat.