In my experience Toolstation are pretty good at such things. The staff have an easier life if they don't argue the toss so are pretty relaxed about returns.
I believe that when this happens the warranty re-sets so if you can fuck it (not literally it may be some what embarrassing arriving at a&e and telling everyone how you "fell" on it) within 12 months you'll get another new one.
In my experience Toolstation are pretty good at such things. The staff have an easier life if they don't argue the toss so are pretty relaxed about returns.