Installing a consumer unit (fuseboard) in a bathroom or shower room is generally not recommended due to stringent safety regulations. Such installations must comply with building regulations, BS7671 wiring standards, and manufacturer instructions, ensuring appropriate Ingress Protection (IP) ratings for moisture-prone environments. Specifically, placing a consumer unit within Zones 0, 1, or 2 of a bathroom is prohibited. In rooms containing only a toilet and sink (water closets), installation may be permissible if safety measures are met. However, it's advisable to locate consumer units in areas less susceptible to moisture to ensure long-term safety and compliance.
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https://www.electricalfaultsfixed.com/blog/consumer-unit-bathroom-or-toilet-electrical-regs