These were given to me ahead of my CAF interview earlier this year by somebody who had already been awarded a CAF. None of these questions came up directly, but they cover a sufficiently broad range that you can handle a lot of general questions by having answers ready for them. Ideally, have these sorts of questions in mind when formulating the proposal so that you can answer them in a proactive way.
What would be the best possible outcome of your research programme?
What would be the worst possible outcome of your research programme?
What happens if you do not achieve your goals?
How will you achieve excellence?
How will you know when you have achieved excellence?
How will you manage the project?
What (if any) are the foreseeable problems in managing the project?
Why you? Why should we invest in you (and this project)?
What are the main challenges/risks with your proposed research?
What will be the roles of the other researchers?
How will you help your researchers develop their own (independent) research career?
How big will your group be in 5 years time/at the end of the fellowship?
Is your work well received?
Where do you see yourself in 5 years time?
What sets you apart from your competitors?
How is your research different to that of your current and past supervisors?
Is the level of industrial support appropriate? How do you plan to make it successful?
Communicating research – how and when?
Why did you choose your institution?
Why don't you continue as postdoctoral researcher?
Where do you get funding from in 5 years after your fellowship?
What do you do if one of your collaborators stops working with you?
Who are your competitors in the UK and globally?
What is the most significant problem in your field at the moment?
What’s the second?
Is there anything else you’d like to raise?