Does anyone know if it's possible to have a bath with a rainfall shower and a handheld shower all over it all controlled by a single panel on the side? Similar to the photo attached. I only seem to be able to find thermostatic mixers which control the handheld and the main shower above the bath but don't include the bath, unless this one does too but I don't see how it fills the bath if that makes sense? www.builderdepot.co.uk/grohe-grohtherm-3000-cosmopolitan-thermostatic-bath-shower-kit-chrome.html