Brilliant white floor and wall tiles

[Nepotism]

Very small bathroom, going for one wall in dark blue or green (depending on which day it is) but want to counteract the gloom with brilliant white tiles, preferably large format. Wickes have porcelain floor tiles on their website but not in my nearest store, but the wall tiles are all ceramic. I'm very picky and don't want a slight variation in shade. AIBU?! Has anyone found a genuinely white tile for both floors and walls?

The grout can be a bigger problem than the tiles. If you use grey on the floor and white on the the walls the tiles will look different even if you use the same tile on both.

I wouldn't put white tiles on a floor: you either have to clean them obsessively or live with fact you can see every speck of dirt, fluff and hair.

If it were me, I'd fully tile in white with maybe an accent band to break things up and a light grey tile on the floor or light wood or luxury vinyl tile.