What is the best advise for him on what to do to stay in UK permanently?
He (and maybe you if you haven't got PR) are going to be subject to what is offered on Brexit. It will take him over five years on those EU laws but Brexit and the end of EU laws, is expected in two.
I have asked you your timeline before, to see if you automatically had PR before you left the UK. If you haven't obtained PR, then it is very important that you exercise treaty rights as a
qualified person at all times.
Ceasing to be a
qualified person means that the EU citizen and all their family members, lose their right to reside in the UK. Ceasing to be a qualified person also means their non-EU family members RC becomes invalid and therefore no work rights anymore for them.
Remaining a qualified person
at all times (if you haven't obtained PR) is even more important now.
- The Brexit negotiations are talking about EU citizens legally (qualified person or PR) in the UK.
- The UK have just changed the law this month and made working without legal status, a criminal offence, carrying up to 51 weeks in jail.
- There are other changes to those without legal status coming in soon, i.e. driving without legal status in the UK being made a criminal act and carrying up to 51 weeks in jail.
If you find you have obtained PR, then after 1 year you could apply to be British citizenship to secure your stay (subject to the rules for British citizenship). But you becoming a British citizen would mean that you could no longer sponsor your non-EU husband under EU laws. If you already have PR, you will have to watch your timing and see what is on offer with Brexit.