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Two types of humidity sensing fan - absolute and rate rise. Absolute (cheaper) come on when the air is humid, which includes when it is raining outside and not necessarily when you think it feels humid, the other sort sees rapid humidity increases and triggers from them, which means it captures showers/tumble driers/etc.
Dramatic_Hammer
Is that a zone one fan?
Our electrician recommended this one (also from TLC)
https://www.tlc-direct.co.uk/Products/VASF100TC.html?source=adwords&ad_position=&ad_id=315107931576&placement=&kw=&network=u&matchtype=&ad_type=&product_id=VASF100TC&product_partition_id=987624279567&campaign=shopping&version=finalurl_v3&gclid=CjwKCAiA57D_BRAZEiwAZcfCxWWYcdO3_8DyybHzVX4KPf5LricxfYMQh0d2ilkBFZJDojWUyfewCxoCYDcQAvD_BwE
Some of the posher ones have humidity sensors which does sound good (if it works).