Finally, I made time to play about more with the graph tools in ALBA. As suggested by Derek Walker in his helpful emails (see correspondence), I was using Excel unnecessarily. The tools in ALBA are equally as powerful and significantly easier to use.
Delighted at having learned a new skill, I also find myself feeling pretty dumb for not knowing about it already. I suppose that's what comes of being largely self-taught, and learning as I go.
The experieince made me ponder how the kids, and possibly colleagues, must feel sometimes. Surely gaining knowledge should be celebrated, it shouldn't mean feeling daft for not having known in the first place. Am I reading too much into it?