Account holders at HSBC, Lloyds Bank, Santander, TSB, Nationwide Building Society and Virgin Money have been issued a warning over the fraud protection afforded by the leading banks.
It follows an investigation by consumer group Which?, with results suggesting the firms may be leaving customers vulnerable to fraudulent spoofing attempts. Spoofing is when scammers disguise themselves as legitimate companies - such a banks - by using email addresses and numbers to appear as the genuine firm or retailer.
To make it more difficult for fraudsters to impersonal them, companies can sign up to Ofcom's Do Not Originate. The regulator uses this to compile a list then shared with telecoms providers to help them identify and block calls that are likely to be scams.