As a tiler. if there are any faults with the tile, he/they should have picked up on it and nformed you, especially if there is a significant amount of distortion within the tile body, as said before, Ive never had this with B&Q stuff,infact ive always found them quite good, Kilty has said there s a lot of inconsistancy with these tiles, but I can assure you I had similar distortion problems with Porcelanosa stuff, supposed to be high end, arrogant rep turned up giving out, he went away with a bomb up his ........., the tiles were duly accepted by the client, but ONLY because of deadlines, given more time they would have made them change them, some 2000 mtrs. It has been said, you need to o to the store and take it up with them, managers at these stores can act on their own discretion, if no joy,the main offices for B&Q are in Southamton, they distortion problem I would envisage would be put down to your fixer, the poor quality, ie scratching, you may get some joy, but untill you take it up with them..................... best of luck mate