Thats pretty much what the mechanic said in a nutshell (not as much detail) so I'm happy to be fair. I wouldn't be happy with paying 1300 but hopefully it is approved.
So basically, if a matrix fails, and people fix for £80 and do it themselves its more than likely going to happen again as all the sh1t is still in the system, or at least its more likely to.
Very true but since I don't have the option of a warranty claim, I'll happily change my matrix for €80 every 2 or 3 years if I have to. I did mine at the same time I had water pump and t/stat and housing changed, so I ask my mechanic to dump as much coolant as possible.
Certainly not as good as a full system flush but since it took 90,000 miles to get blocked, I hope it won't need any TLC for a while!