Retiling ONLY the bathroom floor??

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Hi all. I am thinking about giving the floor in my bathroom and ensuite a freshen up as it appears that the wall tiling was recently re-done (say last 5 years), but not the terrible brown wavy floor tiles. God only knows why.....but I am wondering about what would be involved just retiling the floor tiles only. Some further info is that the subfloor is concrete and the showers are hobless. Any info will be greatly appreciated.

Thanks a bunch all.