Our design team suggest you use Grout colour 20 Antique, if you are using this tile on its own. If however you are also using a decor and border, refer to the grout colour we suggest for that and also use it on your plain tiles to unite the surface.
Recommended Grout Joints - (We have assumed that your substrate has a perfectly flat and plumb surface, please check with your tiler.)
4mm grout joint. Based on this joint size, 1 bag of grout would cover 4.5m².