In all this, we forgot to mention Ferodo who have been in the braking game for eons. I've fitted Ferodo discs and pads several times with no problems.
I often search eBay for genuine manufacturer old stock being flogged off by, in our case, VX dealerships. When I had my Saab 9-3, I picked up 3 or 4 sets of either front or rear pads, genuine GM, for as little as ÂŁ15 delivered from dealerships. Same with discs, picked up 2 pairs of brand new genuine GM boxed discs for ÂŁ30 each. I've currently got a set of Bendix premium front discs on my little Viva that cost ÂŁ31 for the pair from GSF car parts. They are excellent. Shop around.