In
A H wrote:

The ""Scottish pound note" problems" is only a *problem* if you are a little
Englander who fails to realise that Scottish bank notes are *legal tender*
throughout the UK.

Scottish notes only have to be accepted in Scotland. Likewise, Bank of
England notes only have to be accepted in England and Wales. Some
retailers in England will take Scottish notes because they recognise them
and know that their banks will take them (same for the various Northern Irish
notes). Everyone accepts English notes, not because they have to, but
because sterling is an international currency.

I heard a lawyer explain this on "Money Box Live".

--
kedron