Don't let it put you off tiling Oasis sounds like you got off on a bad one...b&q tiles are to be avoided like the plague anyway as is there Tileloc flooring...they are not tile specialists...there tiles are crap they all vary in size, they are poor quality, and when you ask the staff if they have to be sealed etc they have no idea...better sending your customers to Tilebase...or somewhere similar where they can get good service, high quality products and good advice and easy tiles for you to lay...
I laid some polished porcelain from wickes recently and it was and absolutely nightmare not even going into it now as its to painful...but now if the customer buys tiles from and of the sheds I check for damaged,different shades,size variations,wax coatings etc etc and charge accordingly...try to steer people away from those places as much as possible.