I wasn't aware the ratchet mechanism isn't covered by the warranty.The ratchet part went on my Halfords Professional 3/8 ratchet. This is specifically not covered by the warranty. I bought a new ratchet replacement kit but turned out that they had changed the design.
Rather than sort me out a kit for the ratchet I had they just swapped the ratchet for a new one.
Of course YHMV.
I'm guessing my local branch wasn't either, as they swapped mine no questions and didn't even ask for the receipt, which I had just in case.