Could two teachers teach Topics 1 and 2 in parallel?

Yes, lots of our centres have two teachers running Topic 1 and 2 in parallel.

However, students may meet phospholipids in Topic 2 before they have covered the structure of lipids in Topic 1. The Topic 2 teacher would need to provide more depth than appears in the resources at that point.

This answer is also true for the new course starting September 2008.
See the teaching schemes for the Sept 08 course.