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Check the regs but ipx4 should be allowed in Zone 1 according to my very recent check.
Zone 1 :- Electrical items installed in this area can be mains voltage but must have an IP rating of IPX4 or higher and must be fitted to a 30ma RCD or equivalent RCBO protected circuit. Low voltage items can also be installed in this area, but the transformer must be located outside of zone 2.
The one you linked to is IPX5
We have a LV Extract fan in the bathroom with a burned out motor. Any recommendations/reason to not replace like for like?
Not sure if it's actually in the splash area from a safety/zones to require low power
https://www.xpelair.co.uk/product/lv100hta-4100mm-selv-axial-extract-fan-kit-humidistat-timer