u/Appropriate-East446

I'm 2nd on a specialist AP panel. Got an email asking if I'm interested in the upcoming vacancy which was just approved. I have emailed them to say yes. What would be the timeline now?
As I'm no.1 for an AO in a county council panel expecting an offer shortly and not sure if I should accept knowing the AP is what I want and with the offer pending.

I have an interview tomorrow for an AP equivalent, it's capability framework. Never done one. Other than having examples, understanding the specialized role is there anything else I can do to prepare.
What are the types of questions asked ?