"Sorry for the diversion, but can anyone tell me definitely whether Scotland will keep the pound, and who is responsible for making that decision?
"No one can say anything for definite."
Well, it's definite that iScotland would make the decision.
They cannot just "keep the pound" if they secede, because that has been ruled out by the country they are choosing to leave.
They can however continue to use the pound (tricky, as they might not actually have enough pounds in circulation, and only British ones would be backed by BoE) or a Scottish pound linked to the British one (like the Hong Kong dollar is pegged to US dollar at a fixed and rarely changed rate).
Or if they seek EU admission it might have to be the Euro.
Or they coukd attempt a brand new currency (calling it whatever they like, pegged or unpegged to any country as they want).
As there are so many options, and iScotland has not said which it prefers, that is why so many people say uncertainty over future currency continues.