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What could a malicious party potentially achieve by having *just* a name, account number, and sort code?
When you want to pay a bill on line there are several ways to do it. You can give them your credit card details: Name on Card, zip code, credit card number, and 3 or 4 digit security code on the back. Most of the information is available on the card or via an easy Google search. If the crook has your card they can use it to buy something.  You can contact your bank's website and establish a one time or recurring transfer. You provide the information about the person/company. Your bank knows who you are because you used a secure system and your password. Their bank accepts the money because who would refuse money, they don't care who you are. You can provide the company with your bank info (bank number, your account number, and your name). If your bank limits their transactions via this method only to legitimate organizations, then your money will only be sent to legitimate organizations. But if the organization has no way of knowing who is on the other end of the phone or webpage, they may be withdrawing money from a bank account without the account owners permission.  In the example article a person found a charity that had lax security standards, they were recognized by the bank as a legitimate organization, so the bank transferred the money. The charity will point to the form and say they had permission from the owner, but in reality they didn't.  The subject of the article was correct, all the info required is on every check. It is just that most people are honest, and the few security hurdles that exist do stop most of the fraud.