Hi I have a downstairs loo that is beautifully tiled in the ugliest of tiles and I have loads of lovely tiles left over from doing my bathroom I have never done tiling before but I watched the geezer tile the bathroom so I know the principles but what I need to know is can I tile over the existing tiles and is there any thing I should know I watched a youtube video the geezer used some black sheeting but it was a US video so dont know what it was and he was doing a floor and I didnt like the look of his bandana. Thanks Sarah