I am instantly put off when interviewees ask about salary - it is very rare that I am interested in such candidates. DON'T DO IT. The impression shoudl be that it is the job you are keen on, rather than the benefits.
Be honest, don't pretend to know things that you don't. always emphasise that no matter how much experience a person may have, there is always more to learn and that is what excites you about returning to work. If you're scared of returning to work admit it, and then say that you have always found that going through major changes (and use your SA-UK move as an example) provides the life experiences that make people grow and expand their outlook and that is why you want the job even though it will be an upheaval.
Don't take your DD. Move heaven and earth on this one and if necc get DH to 'time' a doctor appointment or something and do the 'exchange' well away from the office.
As you know the person, be friendly/familiar at the very start, but as soon as the first 'real' quesiton is thrown at you switch straight into professional mode and if you can ignore the fact that you know each other (unless of course you can use events that she is well aware of to express a viewpoint)
what an interviewer is looking for is:
- do they understand the job
- can they do it
- will they fit in
- do they want the job
- can we use them for other stuff as well as the job
- do I like this person
- will they stay with us or move on quickly
No one is out to trip you up, so try to relax. If it meant to be it'll probably work out.
I like some of the question suggestions and my 2 personal favourites which I use ALL the time is "If you had a magic wand, what would YOU change about the organisation?" and "What is it that you enjoy about this paerticular organisation which keeps you personally motivated?" Both questions give them food for thought, they usually result in extremely honest answers about the best and worst of the organisation, they make the interviewer think you are genuinely interested in the company itself, rather than just job-hunting, and they go away feelign as if they have had really good 2-way connection. Even better, they take a while to answer and that gives you breathing space sometimes to get your own thoughts together. If she asks you what your DH would say to those questions be very coy about your response, say that your GH is happy there but that he doesn't discuss the organisation in any detail. blah blah: she won;t believe you but will then conclude that you are not gossippy, which is V importnat for the type of role you are going for.
good luck