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Old Mod
Haha yeah I know have your fair share mate.Oh yes, everything straight forward here, you've clearly never worked on a Spanish house
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If the screed is blown can you not work back towards the units undermining the tiles so they break easier. Score the tile and tap it with a club hammer..

The screed is fine, it's just bad prep and floor is blown. But undermining the edge pieces may well be worth trying.
I'm expecting the pieces to fall away anyway but just in case......