I said I'd get back to you, Iona, in around 12 hours so this is it.

As I said, I think Penny has done a sterling job of producing a critique of your post, so to add anything to her comments would, I think just make things more confusing. There's plenty of things to get to grips with there and giving more would be more of a hinderance than a help.

In the interests of helping you state things more clearly, I did write a long scribe which would assist you in formulating your arguments better, but then I thought, why bother? But if you want to do so youself, I suggest you read about 'Two Column Proofs'.