Transferred cash with HSBC recently (private bank). They had already checked source of funds etc, and I went to bank to make transfer as £10k online limit.
All went ok I thought, but when I left HSBC apparently decided to ask for clearance from the NCIS (criminal) for money laundering. As a result my funds debited, but were frozen for 7 days, and no one woukd speak to me about it. (As in "I'm sorry sir, there is no one at HSBC who can tell you where your money is").
They were doing training when I went in, and I'm convinced they decided to show trainee how to follow procedures. I missed a commercial deadline, and if I hadn't had long relations with guys on the other side, could have been defaulted and sued.
No more HSBC for me, surprisingly enough!