I have started renovating my bathroom (1930 house) and the amount of botched jobs from previous owners my plumbers are finding is quite unbelievable.
Today they fixed the shower plumbing. Some bright spark had managed to remove the original bath and then install a shower with a set up that meant the water did not have enough 'fall' to run into the drain pipe and in fact was even going backwards into the shower drain as the pipe was higher than the shower...
The toilet is equally badly plumbed (I had a leak from the cistern that dripped into the ceiling below) and the basin is too big for this small bathroom which means you can't even open the door properly and on it goes. So everything will have to come out.
Would love to hear other people's bathroom horror stories so I can at least tell myself that I am not the only one with these issues...