L
LM
James that tile sounds quite textured. Try scoring it several times until you’re definitely through the glaze then gently weaken it with the breaker at the top end 15mm back from edge until you hear or see the surface begin to open but stop at that point and move back to the bar end with the handle and in a slow and gradual action apply force with the breaker and see if that works.Here is a vid of what I’m doing: