The official document says:
1. My understating is that 2nd referee don't need to be a professional is that right?- For an adult application, one referee should be a person of any nationality who has professional standing, eg minister of religion, civil servant, or a member of a professional body e.g. accountant or solicitor (who is not representing you with this application).
- For all applications, the second referee must normally be the holder of a British citizen passport and either a professional person or over the age of 25.
2. Is there an extended list or it's just what's written in the document of "Referees and Identity"?
3. Do they just need to write full name, signature and date? where my picture glued above..
4. then I need to scan it an upload it through UKVCAS process?