There must be some way of adjusting them. Have you removed the leather surround around the hand brake lever and all around the centre console to see if you can see the adjuster?

It's been a hell of a long time since I worked on an older Mondeo so I am struggling to remember.

I honestly can't see Ford not putting an adjuster on the hand brake cable though. Every other model they make has an adjuster on it. I certainly don't remember struggling with the rear/hand brakes.