I've learned SO MUCH today from your website! I've been reading around the board here for about an hour. Had questions I couldn't find an answer for yet

I'm British, my wife is Chinese. We've lived together (spent zero time living apart), married, for 7 years in China. She is about to apply for a Settlement visa. We will return to the UK with our child who is 5 years old and a British passport holder.
If my wife is successful, then after returning to the UK... a few questions:
1) Can she apply for her ILR immediately after taking the Life in the UK test there?
If successful applying for her ILR then...
2) Specifically since we have been living together overseas for more than 4 years together as a married couple, how long will she have to wait until she can submit her application for naturalization? i.e. is it within 28 days of 1 year, or a shorter period of time?
She may also want to visit her family and spend some time working on the family business in China after having got her ILR visa. So...
3) Is there a limit to the amount of time she can be outside of the UK during the period of time she has her ILR visa and will it affect her chance of success applying for naturalization?
And just one more question, a really interesting one that even the VFS in China haven't been able to give me a clear answer on!
Our kid was born in China. He has a Chinese birth certificate. He also as a British birth certificate and a 5 year British passport, applied for before he was 3 weeks old. That passport expired three months ago.
We visited the UK in 2006 for a family holiday. He was unable to use his British passport since the Chinese authorities would not allow him to leave China on it (no Chinese visa stuck inside it)... after all, he was born here. So to visit my family in the UK we had to apply for a Chinese passport for him and apply for a UK Visiting visa. This all worked out fine.
Now he needs to return to the UK with us to start school. He is school age and the Autumn term starts really soon. We already understand he can't use his British passport to leave China, expired or not.
The VFS here isn't sure whether we should apply for another Visiting visa for him, or a Right of Abode visa for him. The Visiting visa costs 80pounds. The RoA visa costs 300pounds.
So, last question, and I understand it is my personal decision ultimately, and that this is not legal advice...
4) Which visa should I be applying for, and, the icing on the cake, why?! (this is like a really tough Trivial Pursuit question!)
I'd be really grateful for your help with these challenging questions.
Thanks a lot!!!

Sincerely,
Ash
