The Royal Bank of Scotland £20 note is a banknote of the pound sterling, the current cotton note, first issued in which year, bears an image of Lord Ilay, one of the founders of the bank, on the obverse and a vignette on the reverse of Brodick Castle, a castle situated outside the port of Brodick on the Isle of Arran, an island in the Firth of Clyde, Scotland?
The Royal Bank of Scotland £20 note:  The current cotton note, first issued in 1987 bears an image of Lord Ilay, one of the founders of the bank, on the obverse and a vignette of Brodick Castle on the reverse.
i don't know