SHOPKEEPERS are being warned of a scam which has seen several Portishead stores cheated out of �20.

The con has seen a man, who appears to be drunk, buy a small item using a �20 note.

Just as his change is being counted he says he has the right money after all and hands back the change. He takes his note back, slipping it swiftly into his pocket before counting out the correct money.

He then asks for his �20 note and tries to convince the shop assistant they have not already handed it back by showing an empty wallet and no cash in his hands. To add to the confusion, a female accomplice also strikes up a conversation with the assistant as the transaction is being made.

McColl’s newsagent and convenience store in Portishead High Street fell victim to the scam on February 29. A spokesman said: “It seems to be a well-rehearsed and convincing practice which causes confusion and puts pressure on the assistant to hand over a �20 note.”

Police are warning retailers in the area to be on the lookout for the couple who have an Irish accent and are thought to be in their mid 40s.

Anyone with information should call the police on the non emergency number 101.