We seem to all be satisfied that the work is nowhere near good enough. Now you need to know what to do from here. All things being fair you should give him a chance to put his work right but in order to do that he would have to rip up the entire floor, then the tiles,adhesive,UFH and the laytex would have been ruined and wasted. No good just kicking him out as it is going to cost you a heap in materials.
You defiantly need to have words with him when he comes back and show him how bad it is.