Sounds like youve had bad luck on two fronts poor tiles and not getting a fully trained
tiler in, ive only been a member of the forum for a few months and the amount of complaints about B&Q tiles and crap tiling by so called tilers just keeps piling up.Wont call him a
tiler but bloke who fixed them on the wall should have spotted shade difference and swapped them, there are disclaimers on many boxes of tiles saying once fixed cannot be taken back as for
tiler ( spirit level)!