We have another problem. Our Mint also makes Swaziland's lilangeni from exactly the same blanks. At 14 to the £ these swamp certain area's vending machines!
Paper money is getting harder to forge. Our notes are made with a special tough cotton rag with a crisp 'feel' and are intaglio printed, with a hologram. Even a blind person can feel a litho or laser copy £ is duff, as intaglio indents the note on the engraving lines.
BTW. The Nazis forced jewish experts in WWII to make perfect copies of our old black and white 'fivers'. These were dropped over England in vast numbers: And practically every one was handed in to the police! The forgers failed to make perfect US dollars, defeated by your rotary press method which slightly distorts the printing.
