Hey
@FutureTraineeMaybe,
You are absolutely right!
If I were answering this question, I would definitely provide specific examples of how I demonstrated these qualities. However, I would make sure to first explain why I believe a particular quality makes a successful lawyer, as this is the core of the question.
Given that you are applying to train at the London office, I would recommend focusing on issues that will affect London/ UK-based clients and therefore the firm. It doesn't necessarily mean that the issue has to come from the UK, but it would look best if it has direct relevance for the London office's clients.
Hope this helps!