Fake old notes deposited

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Dear Bank of England,

When each new polymer note was introduced, how many fake notes (of each denomination) were deposited to be exchanged to new notes? I.e. How many fake old £20s were deposited (to be exchanged for the new notes) after 20th February 2020?, etc. (for each other denomination)
I imagine calculating this may require looking at how many duplicate serial numbers were received, and/or reports of fake notes being submitted to banks, as well as other means. If either option is not possible to calculate or if another means of fake counting was used, then please let me know.

Finally, how many of these fake notes (for each denomination) were exchanged into new notes (if they weren't all rejected)?

Yours faithfully,

Stephen Morris

Enquiries, Bank of England

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Dear Stephen Morris

We acknowledge receipt of your email dated 4 June below (our ref; CAS-62194-P5V8G9).

We will reply in due course.

Yours sincerely

Information Access Team
Bank of England

Threadneedle Street, London EC2R 8AH
+44 20 3461 4878

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Enquiries, Bank of England

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Dear Stephen Morris

Please find attached response to your email dated 4 June below.

Yours sincerely

Information Access Team
Bank of England

Threadneedle Street, London EC2R 8AH
+44 20 3461 4878

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