How much does a Royal Bank of Scotland 20 pounds sterling note with the face of Lord Jilay and it says First Governor and the other shows a photo of Brodick Castle?

The Royal Bank of Scotland's £20 note featuring Lord Jilay as the First Governor and Brodick Castle is a collector's item. Its value can vary based on condition, rarity, and demand, but generally, it may range from its face value to several times that amount for pristine or rare editions. For an accurate appraisal, it’s best to consult a currency dealer or check recent auction results.