Watch our short film on counterfeit prevention:
If you suspect that you have a counterfeit banknote, please take it to your nearest police station. The police should fill out an NCO-1 form and provide you with a receipt and incident number. The suspect notes will be sent to the National Crime Agency and if counterfeit to the Bank of England for further examination.
If you have information about someone making, selling or using counterfeit banknotes, please contact the police or phone Crimestoppers anonymously on 0800 555 111.
To find out more visit the Bank of England's Counterfeit banknotes website.