Ok, There is one area of the bathroom grout(one tile) that has cracked. I don't want to lift it at the moment, as SWIMBO is thinking that she would like it all changed!
The tile moves slightly when I stand on it, so this is what has caused the grout to crack.
Can anyone recommend some sort of flexible grout, or is it likely I could squirt some thing into the gap that the grout was in, that would run under the tile and stop it moving.
Its only for as long as I can put her off replacing whole bathroom floor, the nicer I can get it, the longer I can go without replacing it.