The scam alert was issued by purchasing co-operative AF, based at Honingham Thorpe, outside Norwich, which sources more than £300m of agricultural goods every year on behalf of its 3,000 members across the country.

An AF spokesman said: "We’ve been made aware that some members have recently been contacted by scammers posing as legitimate suppliers.

"These impersonators are attempting to redirect payments or obtain sensitive information by........

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