Even though Scotland is part of the UK, they print their own bank notes from 3 different banks: Bank of Scotland, Royal Bank of Scotland & Clydesdale Bank. Same with Northern Ireland (not Ireland proper), their own version of the currency is from Ulster Bank. Despite that, they're both categorized as "Pound Sterling" (GBP).

Meaning they inherit the same monetary value as the British Pound, with the only difference being that they're issued by different banks (like the ones from the UK proper are issued by the Bank of England) while the Scottish ones are from either of those 3 banks mentioned & the Northern Irish one is from Ulster (and mainly used there).

Even though, both versions of the "Pound" exist: are they recognized in the UK (like Britain itself) as real money (legal tender) or will they consider it play money (refuse to accept)? The thing is, are they exchangeable in Europe or will there be issues with foreign exchanges on dealing with both Northern Irish & Scottish Pound notes?