Enlarge the banknote image and look deeply into the centre, Deeper.... You're getting sleepy 
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Posted 11/09/2022 09:17 am
A bit of research came up with this response:
"They are used to test ATM machines
https://en.numista.com/catalogue/ex...a304847.html
De La Rue plc is a British company headquartered in Basingstoke, England, that designs and produces banknotes, secure polymer substrate and banknote security features (including security holograms, security threads and security printed products) for central banks and currency issuing authorities.
It is listed on the London Stock Exchange"
"They are used to test ATM machines
https://en.numista.com/catalogue/ex...a304847.html
De La Rue plc is a British company headquartered in Basingstoke, England, that designs and produces banknotes, secure polymer substrate and banknote security features (including security holograms, security threads and security printed products) for central banks and currency issuing authorities.
It is listed on the London Stock Exchange"
