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Changing shower heads / handle / installing shower cubicle

Hi all, I've got 2 projects in mind. 1. Changing the shower head and mixer in one of the bathrooms as it's currently broken. The handle broke off. 2. Changing the shower cubicle in both bathrooms as well as the shower head and handles. Would be good to get a quote for both projects separately and the approximate time that the projects can be done. Attached photos of the current shower units. 2nd photo is the one where the handle has broken off. Thanks!