I've been in a few British houses where the bathrooms had carpets. We even rented one as students.
I can assure you it was the grossest thing ever, and clearly an idea of someone who doesn't pee while standing. But apparently in 80/90s Britain it was still considered "cozy"
In college, I rented a studio apartment in Utah that had 70's shag carpet in the entire bathroom! My first week there I hadn't gotten a bath map and it was super weird stepping out of the shower onto shag carpet.
I can assure you it was the grossest thing ever, and clearly an idea of someone who doesn't pee while standing. But apparently in 80/90s Britain it was still considered "cozy"