Client here. Having an ensuite made and need to decide on exact bathroom width. Crucial to this is how you do internal corners perfectly?? Tiles are 250x50mm, 8mm thick planning a 2mm grout. I want stacked vertical pattern and I want a whole tile meeting whole tile in the internal corners. I don't want any metal trim to show either. Because they are narrowish at 50mm any overlap in the internal corners will show up and I want it to look neat. How do you guys do this? I presume with a spacer. Please help as I have 36hrs to give precise location of studwall. Cheers Olly