You can find an electronic PDF copy of the USA manual here:
https://owners.nissanusa.com/content/techpub/ManualsAndGuides/LEAF/2019/2019-LEAF-owner-manual.pdf
I am not aware of a UK version of the manual being available.
As mentioned, you can zoom in on sections of this PDF manual to get a bigger view.
If you want a hard copy of it:
* The PDF copy is provided in 8.5"x5.25" pages, but it has good resolution, so you can print the pages in Landscape orientation, for paper size 8.5"x11" (Letter) or greater.
* You can ask the local Nissan dealer for a copy.
* You can buy a copy online.