Hi Jobee,
I had the same thing saying things needed to be certified whilat I was waiting for our police checks, I just scanned in a coloured copy of passports for another section, our case officer then wrote back saying all documents had been received the only thing outstanding was the police check so am assuming they have accepted this as they have not yet asked for a certified copy, I did write to them asking for clarity, whether this was enough or did they need anything else I am yet to have a reply which is a bit frustrating as it was 15 days ago I wrote to them. If and when I hear anymore I will update you but I was adviced by others to just uploaded colour scanned image which I have done and then I will wait to see what comes back.
Hope this is of some use to you.