It's great that you're getting ready for this in advance. Your final review should follow the same course as previous reviews, but if you've run into issues previously, it wouldn't do any harm to ask your administration team directly what they'll require. Typically though, it should be your last 3 months bank statements, and any pay slips that tie into this. 

Hopefully some of our resident IPs can chip in too with info about what they would expect.

Good luck!