Jig Sore - what a shame your post is so disrespectful after all the helpful and well-informed comments of other cyclists. My bike was offered and sold to me assembled - so I have every reason to expect it to be done competently. It's not a question so much of 'after sales' as selling it in a useable state in the first place. Learning to 'look after things yourself' has nothing to do with accepting shoddy goods that are under warranty so you have totally missed the point, I'm afraid.
this is halfords we are talking about... this is where you went wrong. you can bleat on all you like about could and should... the fact is they can't and won't and they don't care either