Hi Sarah.
As you mentioned that us 'haters' just don't understand what unschooling is, I did some research and found you this. This is from an unschooling blog by a family in the US- it's their CURRICULUM PLAN for the year they have taken the time to draw up, taking into consideration their child's interests. The child in question is in ninth grade which is academically speaking the equivalent of year 10, but remember that ninth graders in the US aren't working towards specific syllabus exams like GCSE students are. However, take a look at the level of planning involved at the start of the year.
You might find the section on unschooling through travel particularly interesting.
We don't do grade levels, but if you're wondering what radical unschooling 9th grade-ish style looks like, here's our 14-year-old daughter's plan.
unschoolrules.com
Just to add as well, before you even THINK about saying 'but not having a plan is what works best for our family.'
I don't care. Not having a plan might well work best for your family. But Isabelle is fifteen years old, and in two years' time she needs to have an absolute minimum of five good GCSEs under her belt if she's going to have a choice of career paths, and the chance of getting a good, stable job with a decent income. Why wouldn't you want that for your daughter?
The only way Isabelle is going to get those GCSEs is with structured, syllabus-specific learning, starting right now. This is quite literally make or break time for your daughter's future.