I received an email from someone who applied for and got a Bounce Back Loan from Santander, many months later they received a somewhat threatening if not ominous letter from that bank. Having checked, it appears many people have received such an email.
This is what Susan Allen, CEO of Retail and Business Banking, Santander UK has said about post Bounce Back Loan drawdown account checks:
This is the letter that SME was sent by that bank:
