Cheers for that Kev...he's coming round about 4.45 so will see.
I look at the tling in my kitchen which was done by a tiler and I look at the bathroom done by a plumber and I can definitely see the difference.
I am a bit of an anorak when it comes to tiling! The set out in your bathroom is wrong, there are no wraps in the one corner I can see on the photo, the tile grout joints are not straight in 2 areas, and the widths vary in Some places. However what is worse is that it looks like some of the wall tiles are not fixed flat. I may be wrong and it may just be shadow?
I once had a bathroom completely refurbished with the toilet and bathroom being knocked into one. The plumbers who by the way were excellent PLUMBERS said they would rebuild the wall and move the doorway. They did what I thought at the time was a GOOD job. A couple of years later we were having a complete refurbishment of our kitchen which was done and overseen by a foreman who was by trade a cabinet maker. Part of the refurbishment was to move our downstairs loo from under the stairs to the hallway and build a complete room for it at the bottom of the stairs by altering the stairs and building a return on them. When it was finished I was so impressed I took the cabinet maker up to our bathroom and asked why the door of the bathroom wasn’t as well fitted as his. He just shrugged and said the door was in the wrong place, it was not straight and had been fitted by someone who thought they could do stud work but in his words no way was the guy a carpenter. In other words the plumbers had done a job, which was at the time approved by me. Just as your plumber has done with your tiles. Not the worst I have seen but, you would be surprised what people accept these days! If the issue with your grout had not occurred you probably would have been happy and never noticed the faults with the tiling!