This isn't going to get to someone at HSBC. Nothing will change.

  They hired another company to do it.
  The project has been over for 4 years.
  The man who determined the requirements no longer works at HSBC or the other company.
  The coder doesn't even know HSBC is using his code.

It's absolutely useless - humans going into the age of software. It's a death spiral of I don't know's for a hundred miles.