Having now completed my VI (thank you for all the advice, I think it went alright), I’m going to pass on some advice to save you having to scroll back through 90+ pages and to save a lot of Google searching.
The questions really do focus on this the Civil Service competencies: Collaborating and Partnering, Building Capability for All, Managing a Quality Service, Delivering at Pace.” (FAQ page)
Honestly, the best thing you can do is have a list of examples, record a few questions by yourself so that you become accustomed to the idea of it, and try stick to the STAR method as much as possible (I deviated a bit which annoys me but oh well).
Good Luck!