Hydrulic disk brake spares - help required

Hi all
I have a Sterling/Spaq front disk brake and I noticed it "pulsing" under heavy braking, I have now check it and the disk is warped and releases in one area of the disk. To check I marked the area and then rotated the disk on the hub itself to check if it was the disk or the hub casting and its the disk.
Question, does anyone know if you can get a replacement disk and where from?
I have a Sterling/Spaq front disk brake and I noticed it "pulsing" under heavy braking, I have now check it and the disk is warped and releases in one area of the disk. To check I marked the area and then rotated the disk on the hub itself to check if it was the disk or the hub casting and its the disk.
Question, does anyone know if you can get a replacement disk and where from?