Here is a photo off the manufacturer web site of how the cut tile should look when cut. A smooth clean curve which has been cut with a diamond cutter which looks about a 50mm in diameter on the photo (I am awaiting confirmation off the manufacturer) I’ve got a jagged cut that doesn’t line up with the straight cuts. I know the fitters used a 6mm still bit. Also they installed stress pads on the back of the cut tiles and painted what I believe was fibreglass on the back. This along with the grout to the external is what is causing the cut tiles to split ?30mm! That’s a huge amount, were the levels incorrect?
Do you know what type of matting, what colour was it?
Do you have any left over bags of anything at all?
Were they installed using a frame?
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Sorry, seems you’ve just answered some questions.
All other full tiles and grout lines are not showing any cracking or movement whatsoever. Thoughts please? (Compare the manufacturer cut photo compared to what I have had installed on my original post).