3:55am and insomniac - binge-reading an entire thread which is new to me.
Half my family comes from Staffordshire and has accents to match: places like Cannock and Stoke. It's interesting they had a sort of "thing" which the Lancashire/North Wales Borders half of my ancestry doesn't. Aunts from Staffordshire were keen on a thing which they only approached in a strange euphemism - the vital importance of the Daily Doors. If one of us was ailing or under the weather, they'd anxiously ask my mother if he/she had opened their Daily Doors today and if not,, when, you know, was the last time....
It took a long time to get this peculiarity.
Apparently if you do not have a daily bowel movement, it causes problems because it's in there and steadily accumulating, thus retaining unwelcome toxins and bad humours in the system. The road to good health lies in having a consistent steady record of daily bowel movements, so as to give it no chance to lurk and go off. As even as a kid I could go two or three days without troubling the toilet pan, and I felt in no perceptible bad health for it, this concept perplexed me. As I grew older and wised up, I used to put on a pretence: I'd go to the toilet anyway if one of my aunts were in the house, so as to keep her happy. I reckoned reading the Beano or the Dandy would do it and allow enough time: close toilet lid, sit on it, withdraw folded comic from pocket, read comic, flush an empty lav, wash hands if I remembered (I discovered the sound of running tap and the sight of clean damp hands added to the pantomime) and go downstairs again. Daily Doors duly attended to. Female relatives happy.
In still later life, I read that this was a big thing in late Victorian and Edwardian times prior to WW1, (when people discovered more pressing things to concern them): that bowel health was associated with daily movements and constipation was seen as a debilitating evil. People like Kellogg made a big crusade out of this - cornflakes marketed as an aid to digestive health, et c. As my mother's grandparents would have been of that era, I can see how this might have been transmitted down the family even after the premise was largely debunked. As to why this might have lingered longer in Staffordshire... well, it's called The Potteries for a reason. And one sort of chinaware that every house will have is of course.... I'm guessing the people who made the toilets would hold on to an idea like this for longer?