Finally having some success with the FFTs through MATLAB. Most of the difficulty was tuning the visual display and colour chart to display anything of interest (and then waiting for something to happen to test a configuration of display variables). A very frustrating process.
I initially had some success plotting a waterfall using only the harmonics from the "thd" function, but I quickly realised this, when exported to an array, only includes the actual harmonics (i.e. 100, 150, 200, 250Hz, etc) and not the other frequencies in between.
Now, using the FFT library and some guides (with only a moderate understanding of the process), I have produced the following, which captures the weird signal (along with some other faint ones):
Now as with everything with MATLAB, there are some hidden conveniences! I can rotate the plot into 3D:
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