SELL YOURSELF.
It IS the only thing that gets you into the door and sat in front of them, generally. You have their attention for 3 minutes, grab it.
Although it might be hard (and sick to a point) to sound dead big headed but if you don’t believe in yourself, why should they.
Also, at interview, bring a pack of chocolate hob knobs and offer them around.
We all love them and it might just make them remember you.