We got professional help from a tiler and he brought his angle grinder and did the job for us - it must have been the worst job he had undertaken but as we could no longer get the same tiles and they had been laid over the ground floor we had no option.
The problem seemed to be that they were laid over central heating pipes and the adhesive used 12 years ago obviously did not cope with this. Our tiler told us that the stuff these days is heat resistant due to underfloor heating so we are hopeful that we will have no further problems.
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