Yes, done under warranty,
the only thing I can think of, is that it was a fault with
the o/s/f outer brake pad from new, possibly, or the pad had picked
something up, but the disc was scored right across the entire surface.
on reflection, I noticed a mark on the disc when I picked the car up from
new, but thought nothing of it at the time. (10 miles on clock)
anyway, it is sorted now.
regards Brian.