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obobsmith
Great post mate, and If your levels also out your gonna add to the above:yikes::yikes:[View attachment 3295View attachment 3296
Ok see in picture 1 the tiles are butted up and follow the line of the level
in pic 2 I have inserted a spacer at the top but it is still butted up at the bottom, now look at how big the gap is at the end of the tile from the level. it's opened up by 7mm and the spacer is only 2mm. and this is on a small linear tile, the longer the tile the more the gap opens up, Your tiles look 600mm in length judging buy the door so your tiles will open up even more.
This problem does not occur so easily on square tiles, but if you have a very long linear tile, it's very easy to go off level
Edit: to clarify. say you have a tile 150mmx600mm the length of the tile is 4 times longer than the height, any problem on the vertical grout line will be magnified by 4 fold along the horizontal grout line
on a tile that is 200mmx600mm, the length is 3 times longer then the height, this would be magnified 3 fold
am i making sense?