Is nothing sacred?
I don't recall giving consent for my confidential NHS records to be sold to private healthcare companies. When did you ask me for it?
You'll be telling me next that private companies will be making their shareholders richer on the back of blood donation... Oh! Wait a minute - looks like they will as long as the NHS is safe in your hands.
It's worth remembering that you may find by introducing a profit motive, blood donors might dry up. Surely that's not just bad for shareholders, it's bad for patients too? I'm not sure I'd want that on my conscience...