@Chilleduk
I got approval overnight for level 2 and just uploaded my info for level 3:
But this is a copy from the Electroneum website for level 3 requirements.
"Source of Funds Document
Your document should be less than 3 months old and will be used to verify the information that you have already provided.
We can only accept photos or scans of your document in the following formats: PNG & JPG
We can accept the following types of documents:
- Recent payslip (or recent accounts if self employed)
- Letter from employer indicating salary
- Recent bank statement
Details that confirm your name, current address and identity should remain non-redacted and legible.
Hope that helps out 
