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Since I posted the above, I'd made a change to my website so the original link no longer worked. I've now corrected that, both in my original post, and in the <quote> above. I also found a free app for Android smartphones that allows you to upload Excel spreadsheets, so you can do the checks...

I'm not too sure why we've gone down the road of evaluating Pi to n decimal places. If I want to use Pi, I use the Pi key on my calculator and the Pi function in Excel or whatever programming language I happen to be writing in. IMHO, accuracy beyond the 3rd significant digit is of no value.

I'm assuming those measurements are in old money? You may well be right. I measured the strands as being 0.79mm dia, but it's not difficult to be inaccurate at that level of resolution with hard steel jaws on soft copper!

Good table, stunlawless - I wish I'd found it before constructing my own from experience & measurements! I'd also add that I've come across 3 strand 1.5mm^2 twin & earth cable with solid 1.0mm^2 cpc. The strand diameter is 0.8mm. With the prevalence of smartphones and downloadable apps...