Request - Searching For Notes.

Hello All,
It is great to be part of this vibrant and enthusiastic site. I have been involved with coins for many years, however I somehow find myself taking an interest in banknotes and hope to get my sons involved. I jotted down a half dozen notes that I had spotted on ebay uk that I intended buying for them, I now cannot find two of the notes that I particularly wanted - (nuckle head I know), They were a modern note, probably polymer, the interesting thing about them being that they had some sparkling 1 or 2mm disc shapes spread particularly around the bottom of the notes, these being a security aid. A shot in the dark but does anyone know of similar notes.
Many thanks, Paul