Well, after all that, I feel my understanding of the effects of closing stock valuation on CT was, and still is, correct, though my understanding of why this is so is far simpler than the explanation from the accounting professionals.
Up until previous year end (2023) I'd always used an 'average stock valuation' report, which calculated the valuation based on each historic purchase and current cost. I wasn't over confident in this figure but it was the best option available. As referenced in several posts on this thread, I'd at least been consistent with this approach.
The downfall of the new system I'm using is the lack of flexibility when reporting stock valuation. The only figure available is current cost multiplied by quantity.
Without wanting to cause any further argument; does my earlier suggestion of taking an average of 2023 and 2024 closing stock valuation figures and making a small adjustment for depreciation, perhaps 2%, seem sensible?
Thanks for all the input, I've learned quite a bit from this thread.
Kind regards
Rob