This question aims to determine how you approach your onboarding. As they detail on their careers site, "From your first day, you will experience our comprehensive onboarding programme, which will help you navigate around our activities and business areas, and meet new colleagues." They don't expect you to make a fast impact and reinvent the wheel the second you walk through their doors. Instead, they expect you to absorb information, build relationships with your coworkers, and learn what they've built together and why they do things the way that they do. Showcase that you understand this is the first step and that once you are up to speed and have earned the trust of your teams you hope to make lasting, meaningful contributions.