Fatz diagnosed the squealing as the wear markers so I figured I should change the fron pads at some stage.
Now I was going to post this as a bit of a joke but a question has occured to me.
It seems by looking at this pad, or what's left of it, that my brakes are braking unevenly. They must be braking harder towards the outside of the disc than on the inside. Is this a problem? Should I be worried?