just relax.... just provide what the UKVAKS asked from you...
no need to certified it all...yes you need to provide the original and one photocopy of each. as for your passport and birth certificate photocopy will do. yes as for your fiance passport you have to.
better provide the other stuff too as eveidence of you communication as long as you met her no worries. as for me i provide other documents although they dont asked for it... better to give them everything...
i applied my fiance visa sept. 29 then got it oct 5 so fast no interview...amazing.
i also provide my PRC id, SSS ID, NBI cert, documents from my employer, CFO certificate, my tor and diploma.
good luck....