Regarding the Euro, Scotland would have to agree to one day enter the euro, when they fulfill the conditions. While this was almost bidning (except Sweden's intentional blatant failing to meet the conditions) during the euros success years,since the crisis started I haven't seen harsh reactions to attitudes like this:

Eurozone must `put house in order' before CEE states will join | Emerging Markets

The eurozone must enact sweeping fiscal and governance reforms before EU states in central and eastern Europe will consider adopting the single currency, the region's leading central bankers have warned.

So a Scotland "will join euro, eventually, when it meets the criteria and the eurozone has found a working structure" would probably be enough of real commitment. And that day may never come as the euro appears more likely to split.

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