Another issue is that any wiring diagram or schematic is subject to copyright so no one should be publishing them on the Internet anyway. As far as I know there are no official repair manuals and schematics for UK washing machines and other appliances readily available.
Exceptions. I’m talking about the UK. It seems that there are plenty of schematic’s and wiring diagrams available for American appliances on USA or Canadian repair sites, but not so much for the UK. Some washing machines and other appliances have been known to have a wiring schematic under the lid. I know Miele and a few other quality appliance manufacturers used to place a basic wiring schematic on top of the soap dispenser or underneath the lid. This does not happen on most washing machines though, especially the cheaper ones and they are often very basic