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Dumbo
You don't need to have 2 thin tiles touching . Let's say you get that if you start with a grout line in the centre so move the tile over half a tile and have the middle of the tile as your centre point then you're cuts into the corner will then be at least over half a tile .Thanks all.
Ok sounds like I need to start from the center of each wall and work out to the corner.
This would mean the two tiles touching in the corner (same row) don't need to visually form a whole tile and two thin tiles touching will look ok.
The only way I can see to form a whole tile visually in each corner is to start at the beginning of one wall and work all the way around.