Civil service competencies, need help with specific examples please.

[HarryPottersMagicWand]

I have a job interview this week, civil service, competency interview.

I know the competencies they are going to ask me on:
Seeing the big picture
Delivering at pace
Collaborating and partnering
Managing a quality service

The application needed clear demonstration of Professional expertise which I scored a level 4 - adequate demonstration. I don't know if they will ask more of this in the interview. If I score like this on them, the surely the positions available are going to go to people who give good demonstrations?

I'm struggling for examples. I haven't worked in years due to ill health. I have 2 children at school. I volunteered in school last year and I often help out with the PTA. I have recently completed a business administration qualification and am due to start an IT one at the end of April. My previous job was with a mortgage company (which I had to leave for ill health in 2004 but I remember it very clearly) and in 2006-2007 I went back to college and did my levels 2 and 3 TA qualifications whilst working in a classroom, breakfast club and after school club. I don't really want to be a TA though, my strength does lie in admin and everyone I know says I would be very good at it, even my tutor on the business admin course.

This is all very spread out though and I'm not sure I can think of relevent, up to date examples of these competencies.

Any help would be very appreciated please.

[PuddleTrouble]

I recently applied for a CS job which asked for personal statement containing work history, key achievements and skills. The interview will be based on the personal statement. The other jobs I've seen tell you the competencies to be tested.
I used to get excited hitting the submit button on a job application - now I just feel depressed.