Swift shower tap leak

Swift Eccles 580 2020 (same as 580 Challenger/Sprite et al). We have a double problem with the shower. When not in use there is a constant drip of water behind the the decorative panel that all the shower gubbins is attached. Behind that panel is a small void and the dripping water runs into the shower tray. When in use the shower mixer itself leaks. I can replace the tap myself however am struggling to find a YouTube video or other info guiding the process to remove the panel and tap. Can Any one give me the links to a good tutorial? And any tips?