Thank you so much for your help and for the links to the additional resources - we clearly have a lot to learn about the lesson activity, and (speaking for myself) I'd certainly love to feel more confident about it. The resources will be invaluable, I'm sure.
I was aware that the content pages could be used to allow the students to branch to other content (a bit like a table of contents), but why can you tell me why content pages are more suited to this scenario - is it simply because we're not grading the students?
Of course, next time we might need to support a lesson where grades are necessary - were that the case with this scenario, I'd still be at a loss as to why the jumps weren't working as expected.
Thanks again for all of your help and patience (it's very much appreciated!)