Just to add some more niche currency slang. A few of the Hibs casuals[0] that used to come into the pub I worked at sometimes referred to pounds as “sheets” - “it set me back fifty sheets” = “it cost me 50 pounds”. I don’t know how common it is, I only heard it around these guys.

[0] - Hibs = Hibernian Football Club in Edinburgh, casuals = hooligan supporters (who were alright with me so long as they thought I supported a nothing-team like Montrose and didn’t know I actually supported Aberdeen :D)