Working with Border Force often requires you to engage and cooperate with varying teams. If you work on the flexible team, you'll work at different locations where they might do things differently than you're used to. The heart of this question centres around your collaboration and flexibility. How you answer will help your interviewer determine how adaptable your communication style is to others. As they state on their careers website, "It's essential that our organisation reflects the very best of 21st century Britain, and we encourage applications from all backgrounds and circumstances."