Update:
Finished FP3 vectors. Went through all 20 of the mixed exercises. Got it all correct except for Q15 where my method was wonky. I don't think I'd have thought of using area to find length, that'll teach me to draw more diagrams in the future! I've noticed that I get confused between which form of lines/planes they want me to give. I made the 'mistake' of writing the vector form of a line/plane as (r-a) x p = a x p and r.n = d instead of r = a + ub or r = a + ub + sc.
Did Ayman's vectors test, it was fairly straightforward. Got full marks on that, yay!
Otherwise - putting the work on pause for a bit, going out for dinner. Probably read over matrices and try some questions out when I'm back.