Thank you all very much. The tiler has told me that he's been tiling for 20 years and never had a complaint. What can I say. When I first saw the job I checked some leftover tiles and they were fine. I even took them to the shop who checked them over and showed me how to look for an untrue
tile.
All I want is an honest job for an honest wage. I've seen DIYers do really good jobs because they try hard and they care. The tiler told me a while back that he had had enough of tiling and was bored with it - and it shows in his work. The saddest thing for me is that this is a high end bathroom - Duravit toilet, Alape basin, Schenider bathroom cabinet - and it's all been ruined by a tiler who didn't care.