Hi, my Mira Excel EV shower leaks, seems to be the hot side only I am thinking of changing the £100 cartridge. Does anyone know if it justs pulls out from the rest of the body without having to start undoing water feeds etc.. Also, maybe a daft question but will both supplies need to be turned off if I pull out the cartridge? Thing is, I have two of these showers in the house, the other works OK so I was going to remove the known good cartridge and try it in the suspect ones place...Just a bit wary of breaking things