This is a very good point because, whilst I was completely sold on TSP, when I read the third book recently it all felt a bit odd. Tim not progressing towards death was a big flag. So much so I googled to see if he'd died since. He hadn't so it just didn't add up.
I still went to see the film which I found profoundly boring. And when you saw them asking for teapots of hot water that they dipped their teabags in I was really pissed off.
Knowing what we now know I question the veracity of this.
When I worked in hospitality in the 80s and 90s nowhere I worked, including small cafes, ever gave anyone a pot of hot water on its own without them buying tea alongside.
Pots of tea go a long way to make up the profit of these small cafes because they only cost a few pence, but the return is quite large.