Tiling a kitchen back splash

We recently had a new shower valve bar fitted because the old one sheared off within the bathroom wall. The plumber had to remove one tile, and cut out a square of the wood behind the tile, to get into the wall to fix the problem. The size of the removed tile is 33.5 cm x 42 cm with a depth of 12mm. We now have a large tile, 60cm x 60cm x 10mm, which is the nearest colour match we could find. ...

To tile toilet and batroom floors. 2 rooms. total 5.1 sq meters. cermaic tile 600mm X 300mm.