Hi john,
Thanks for the reply. The discs have maybe only done about 2-3k miles. Only bought them at the end of summer last year!!. The discs were bought as a kit and are not standard brake discs, (335mm) so i am not keen on just going out and buying another set just now!!. Not sure on the come back from the supplier, but judging by the no response from an e-mail, and what i have heard from other folk, they are never too willing to replace them.