It is not easy finding well named product. Quinton Hazell was an OK product but not around anymore although you can still buy their joints from local motor factors, you have to do a search on well known manufacturers like for example GKN. I trust that name and I have found a supplier that sells their CV joints. The Company selling them is known for selling at competative rates but they come in at £85.00, The usual mini parts suppliers are selling "best quality" for £30.00. Unfortunately no supplier name is mentioned so I will opt for the £85.00 GKN part. The difference in price is large but I am OK with that because I trust the manufacturer.
I did see a web site only 3 months ago that listed manufacturers of ball joints and there were more than I expected but I cannot find that right now, there were some well known names so they clearly are still about.
Totally agree about not being able to find quality parts, especially driveshaft and suspension components QH or Unipart I would be inclined to trust (If you can still find their stuff) though even there, there are not any guarantees quality wise.
Worth keeping an eye out on EBay you can pick quality stuff up for good prices. Been looking for wheel bearings recently thought I had come up trumps with a company called 'Simply Bearings' they state on their site they only sold stuff made by reputable bearing manufacturers, Timken, SKF and Koyo to name a few. So I spoke to one of their phone reps and asked whose bearings were in the kits they were supplying he could not tell me as they had no manufactures name laser etched or engraved on them, so I took from that these were just more cheap bearings.
The CV joints MiniSpares are selling at the moment are manufactured by a company called 'Transtec' well that's the name on the box, and they are made in Italy. First Forward any chance you could put a link up for the GKN supplier you had yours off.
Cheers
Stuart