No need for RCD protection at all according the BS7671 bible of regs.
Manufacturers do often put it in their manuals as a must.......to cover their own rectum.
I personally have my shower on an RCD, and when I change a CU, or install a new shower cct, put them on an RCD.....but I would not bat an eyelid during a PIR.
With the exception of TT supplies which are a bit different, the only things you currently MUST protect with an RCD, are socket outlets which may supply equipment for use outside.
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