I hope you know that you should NEVER click on a link in a bank email. Always enter the address of your bank directly into your browser. This is a scam email. The link doesn't take you to the HSBC website but to a fake site, where you are asked to enter all your bank details. Look at this screenshot: (I entered a made up ID - I'm not even a customer of the HSBC)
Dear HSBC Customer,
To ensure you are always protected, we are introducing a new programme
on security called BankSecure-cfx-08 and you'll see a number of initiatives
that will be put in place to enhance your Internet banking experience.
Sequel to the new security measure, our records indicate that your account
was Flagged and has upshot an internal error on our processor.
For security reasons, you must update your account to
restore full access to your Online Banking.
Please Click Here to complete your account update. Sign In to start the
HSBC Bank plc Online Banking