I vowed I would never use them again, as their idea of "Genuine GM parts" differed wildly from my understanding of it.
It would appear, after a pointless conversation with one of their agents after I received some "Genuine GM parts", that is a given manufacturer supplies any part to GM, that means all parts from that manufacturer simply must count as Genuine GM.
I never fitted the Elring cam cover gaskets they claimed were "Genuine GM", as you could tell they would have a life of approximately 2 minutes, as they were rock hard. And as Autovaux would not refund them because I had opened the packet, they went into landfill.
Shortly afterwards, out of sheer stupidity, I bought some "Genuine GM" TREs from them, which upon ordering they assured me were genuine, with a GM part code. They arrived in blank packaging, I fitted them (as the car was desperate for an MOT), and they lasted about 9 months.
So, IMHO, they can take that 10%, and shove it a long way where the sun doesn't shine.
Even if they have started down a line of honesty, they do not deserve to be in business.