I'm not able to find the standard door preparation for a European specification DIN bathroom latch. The kind with a 60mm offset.
This one specifically, https://www.gjohns.co.uk/din-style-bathroom-mortice-lock-60mm-backset-78mm-centres-satin-stainless-steel.html
I have questions like, what size hole should be drilled. Are the knobs set apart a specified distance? Or is only the case size specified?