People are being advised to be alert about a number of counterfeit £20 notes in circulation.

Police initially thought the fake notes were just being circulated in the Darlington area, but it’s now likely that this is a forcewide issue.

Neighbourhood Inspector Mick Button said: “We need people to be alert about these notes, so please be vigilant about checking your change and notify us if you have any suspicions about £20 notes.

“We’ve also been reminding shopkeepers to keep up their systems for checking notes.”

These are the things to look for to check your notes are genuine:

Look for a watermark on the left hand side of the front of the note and that in addition to the Queen’s portrait (watermark) there should be a £20 symbol, which should appear brighter (contrast) than the Queen’s head