I have an external shower mixer I have just replaced. The pipework has the hot on the right, but the mixer requires it on the left. As a temporary fix, I have installed the mixer upside down, so the outlet to the flexible hose comes out of the top.
It seems to work okay, but I just want to check that there's no awful gotcha that I've missed?
I can cross the two pipes over, although it won't improve the looks too much.