Thanks for all the replies. I went to PC world expecting a fight but their response was good. I was well dressed and polite which I think always helped. I simply stated I wasnt happy as the sound was poor. He said something about normally accepting boxed sealed items back within 28 days. He agreed that the sound was poor on these TVs so I said that meant I could use the fit for purpose argument. I couldnt find an alternative in the shop so they gave me a 100% refund with no hassles at all.