Easier to chuck in the bin than try a warranty claim! Have fitted Terrafirma, like the front.
Britpart in my experience, used to be excellent. I ran a 300tdi for 100K and over 14 years until 2017, on mainly Britpart. It deceased with 165,000 on the clock without any premature failures. I replaced all the hydraulics, clutch, suspension, filters etc, even the Britpart exhaust lasted over 12 years!
On the D2, my Britpart front hubs are holding up so far, after 800 miles! However will be more wary in th future£