Santander, a UK-based bank, is warning customers about an increase in impersonation scams where fraudsters pretend to be the bank in order to steal money from unsuspecting victims. The bank has identified several tactics used by scammers, including phishing emails and phone calls, fake websites, and even physical letters sent through the post. Santander is advising customers to be wary of unsolicited communication from the bank, to not disclose their personal or banking details to anyone they do not trust, and to always check the authenticity of the communication before taking any action. The bank is also reminding customers that it will never ask for their full PIN or password, and will never ask them to transfer money out of their account. Santander is working with law enforcement agencies to identify and apprehend scammers, but warns that customers must remain vigilant and take steps to protect themselves from fraud.