I have been having very similar issues, bad judder at braking over 60ish. I know the front discs are scored, it showed up as an advisory at the MOT and i have had a look at them on the ramp.
So is that the full reason for the judder? or maybe a sticky caliper too? No obvious brake smell from the car even after a run, but if i need a new caliper (God forbid), what would be a reasonable price?