Its not a hard kind of interview. At this level the questions won't be challenging. If you're referring to the framework you're on the right track.
You're right the question won't be framed that simply. My tips would be:
Keep your examples simple so they're easy for you to explain and them to understand.
Have a backup example for each competency just in case
Use the examples on your application and expand on them - you say you scored highly on them.
Make sure to give lots of additional local colour to the example - enrich them with detail. By enrich I mean add in things like whether you'd led in a similar situation, what you decided to do differently this time, and at the end reflect on the result. You're not constrained like the 250 word limit on the application.
Be sure to spend most of your time on "how" you did something rather than "what" you did.
Listen to the question - don't just think "aha! Delivering at Pace!" and parrot your answer. For this reason, I think it's best not to learn your answer by rote but to have a mental checklist of what you want to make sure you say. I literally count on my fingers as a prompt! For instance finger 1 will be "I want to set the scene and explain the context" finger 2 would be "I want to talk about the last time I did something similar and how this was different." Etc etc. Easier to remember ten points than 500 words!
Remember the key elements of the competencies:
For leading and communicating, say what you led on and how you communicated it. Make sure to say "I did" not "we did" - if you find yourself wanting to say "we", it's probably not a strong example.
Delivering at pace - remember it's not about how quickly you did something, but how you juggled all your other work when something unexpected came up. Best examples are where you thought you work was all nicely under control/ planned out and then you were landed with something time critical and urgent, and how you re-prioritised, delegated etc.
Good luck!