WORKING BEHIND A till can be busy and repetitive work, so occasionally there can be a slip-up.

But one shopkeeper in Northern Ireland really needs to go back over the basics.

The PSNI have come across a €100 note that was accepted in a shop in Newry, where the currency is often accepted alongside the local sterling.

However, the note wasn’t issued by the European Central Bank, but by the Early Learning Centre.

BBC News reports that it was used to buy a sandwich.

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The PSNI, who are treating the note as counterfeit currency, are appealing to business owners to educate their staff on the appearance of fake currency, and advise them to use a counterfeit detector pen.

“Isn’t it as well the pound is pretty strong against the euro?” a spokesperson added.