From what You can see the "Tanking only comes up approx 4 " at best .,Just let them read the thread Gaz, that should do it.
Although it may look like they've tanked the floor. What's that grey paint at skirting level in the 3rd and second to last image?
Whether he has coated the floor or just the 90 degree angle I can't say ... But I would ( going on what I can see) assume the worse case scenario ..🙁
Just too add ... I met the chippy who just happened to pop in and talking with him.. He wasn't enamoured with the way they were prepping...