I would like to ask a question about how a fictional amateur journalist might obtain specific information from a (UK) private school. The universe is as close to ours as to require little other world building and I do not want to ask an off topic question and waste other people's time.
To me this feels a little too far in the plot/character direction rather than worldbuilding. However, it might be possible to turn it around so it's a worldbuilding question. Instead of asking about how the journalist would research something, could you ask how schools of a certain type (which you'd describe in the question) would protect sensitive information from prying eyes? That feels more like a question about the world to me. Once you have that, you can then work out the plot of how your journalist would defeat their protections.
Does that help at all?