■ Genuine £20 notes will have a watermark, a metal strip and the Bank of England' printed in raised ink across the top of the note.
■ Take your time to check your notes, particularly if light conditions are poor or you are handling a large number of notes.
■ Look at the note, and feel the note.
Do not rely on one single feature and if you have doubts, compare it with one that you know to be genuine.
■ If you have a note that you believe is a counterfeit you must take it to the police as soon as you can. They will provide you with a receipt and send the counterfeit to the Bank for analysis. If the note is genuine reimbursement will be made in full.
■ It is a criminal offence to keep or pass on a note that you know to be counterfeit.