Hi all, I've just had an EPC assessment on my house and there were a couple of points I disagreed with. I'm looking for advice on how to prove my case for 2 points; We have a small section of flat roof (<10m2) - this has been rated "Very Poor" due to "Uninsulated - assumed". I have taken down the light fitting and made a 16mm hole under it that I can get a cheap endoscope in. Sure enough, there's insulation in there. We also have "assumed" for no cavity insulation. Although it hasn't been done during my ownership, I knew there was as we had the windows replaced recently and I took a look in the cavity. I can also see it with my endoscope when I stick it down the gable end from the loft. What constitutes acceptable evidence to prove these points and have the EPC corrected?