Cheers for the suggestions, everyone. I don't like any of those questions, but chances are I'm not going to like the one they give us on the day, either so I'll have a go of one or two of them.
Keep them coming though, if you can. It'd be nice to have a compilation of them for anyone else who needs help/practice.
That was ours exactly...
I ended up writing mine about a lonely man living in the house who finds a sense of belonging with his books. Got 9/15 for it. I thought it was terrible, so I wasn't too disappointed with my mark.