Adrian wrote
Big Les Wade wrote

Anyway, what's your point, that Scotland can join
the euro instead? We shall see. It'll cost them.

And, of course, they'd need to join the EU first

Nope, they are already in the EU.

(Spain's said they'll veto accession)

There is no accession for Spain to veto.

and meet the Euro conversion criteria,

That only appys to those joining the EU for the first time.

which requires successful management
of their own economy and currency.

Plenty of those who have joined lately have done
a hell of a lot worse than Scotland has done on that.