I strongly suspect we will be heading for a no deal situation and reverting to WTO rules when dealing with the EU-27. This is going to be highly inconvenient for many people, especially in terms of foreign travel and trade. I doubt it will be as bad as some think, but it’s not going to be easy to deal with for many.
Perhaps, in time, we’ll re-join the EU. We’d have to accept Schengen and possibly the Euro, but would either of those be that bad? The problem with immigration is that we’re not building enough houses, basically.