ISO keyboard on Mac

Had several issues through the years with UK keyboards not being recognised in MAC OS.

It's worth noting that we can delete the file /Library/Preferences/com.apple.loginwindow.plist

which will trigger the keyboard detection assistant. I had been previously running it and when pressing the key to the right of the left shift, it did not detect the key properly, deleting the above file fixed that part.

It should detect it as ISO then we should select British PC as input source but I also noticed that it incorrectly shows the layout, as in there is no \ key to the right of the left shift, only the z key.

By change, when British Pc was selected, I hit the \ key and the display changed, this fixed the issue, but for how long...

Prior to doing the above, I also connected another keyboard (removed the K95) but I am unsure if this had any bearing on the fix.