It's a very common misconception, there is no requirement for Scottish banknotes to be accepted as payment anywhere in the UK (including Scotland!)
https://en.wikipedia.org/wiki/Banknotes_of_the_pound_sterlin...
https://en.wikipedia.org/wiki/Banknotes_of_the_pound_sterlin...
But in the real world, they are absolutely defacto legal tender - as above, every bank in the UK (and even many beyond) accepts them.
However, the old Swedish notes had not lost their value because they could still be redeemed.
In a formal legal tender situation, you could to some extent require a private party (within the relevant jurisdiction) to accept the notes in payment of a pre-existing debt. You could contrast this with "having value", "being redeemable", "being in circulation", and "being widely accepted", maybe.