Quality Suppliers
Big thanks to Stefan Schreiber of Cohline. Cohline is a company you may not have heard of. They make hoses. One of my SVA failures was the hose I had used connecting the brake fluid reservoir to the master cylinders, I had the prove that it was suitable for use with brake fluid. I Had bought the hose from Merlin. The hose was marked "Cohline 2322 0613". I found and email for Cohline on Google and dropped them a line. I now have an official letter stating that the hose was designed for use with brake fluid.
Thanks also to Yokohama. I needed an official letter confirming the rolling circumference of my A032 tyres for speedo calibration. I gave them a call and 2 days later I had the letter!