I agree, of all the different kinds of UK notes the latest Royal Bank of Scotland notes are my favourite designs [0] [1]. Make sure to look at both sides. One of the confusing things about bank notes in the UK is that there are 5 totally different designs for each denomination: Bank of England, Bank of Scotland, Royal Bank of Scotland, Clydesdale Bank and Ulster Bank. This can lead to some confusion when you try to pay someone with a rarer note as they may not have seen them before. Scottish notes are usually OK. Good luck with Ulster Bank notes though.
[0]https://www.scotbanks.org.uk/banknotes/royal-bank-of-scotlan...
[1]https://www.scotbanks.org.uk/banknotes/royal-bank-of-scotlan...