dug 
OK well, in the end I had to give up and since last night am now on IoS26.
Woke up this morning, rolled over to check the time and for some reason the clock had disappeared from my lock screen.
This is gonna be fun:-(
So my question is, does anyone remember Kaleidoscope? Or was there ever any theming of Quartz UI? I used a theme called “simply grey” for years, it was really beautiful and really visually neutral, the idea being when you were doing graphic work or colour-correction you wanted the interface to not distract. Was lovely…