Thanks for taking the time to reply everyone. Much appreciated.
Taking all your comments on board, I realise the local running is almost certainly killing it so I'm going to give it another charge and try a different Halfords tomorrow.
If they don't replace it, I'll pick a new battery up elsewhere to get the car running again as this is the priority for me.
I'll get the charging system double checked next week when I have time by a third party and see if Halfords replace the battery with some evidence. If they do, I'll have a new battery to sell, or maybe I should buy my own A8 to put it in!
Thanks again for the advice.
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