I'm inclined to agree with Ajax123; for such a large area instead of concrete effect/look tiles just wet pour the whole area with concrete then polish it!
Why spend circa £6k + on tiles to look like something when you can have the real thing.........half the cost!
Just got myself a bath rubber to try. Great bit of kit! very useful, even got my Wife's hair dye stain off one of the kitchen cupboard high gloss doors. Definitely keeping that in the box.
Looking at the pictures again; you could have moved the whole floor to the right so a whole tile was bang centre of the doorway and the cut where the pedastal for sink would have just been a cut out from the side. Just my pennies worth. Would like to see a picture of it finished.
Welcome aboard. Don't forget you still get your ELC's which is your enhanced learning credits, you get x 3, which are £2000 each to use up withing 10 years of leaving. No doubt you'll use one of them in conjunction with your resettlement grant. Good luck