Just to update the above.
The LGV Driver CPC Conversion (Cat C) test IS the test that I needed to choose as an equivalent to the Mod 2 Case Studies test.
From what I can gather, it is because I already have a Driver CPC for my Cat D licence.
Oh and btw, I passed with a respectable 43/50. Very happy with that as it was the one I was dreading the most. Just have my theory test and hazard perception on Wednesday now and hopefully I’ll be just as happy.
Thanks everyone for your help with this, it’s much appreciated. 