hi there, you should be able to download PDFs from the My Account website at this link
It's a bit hidden and takes several levels to get to for your current bill. Go to Bill Details, then View Bill Details. On that screen, to the right of "Your Statement" is a little link for "Print/Save Statement (PDF)".
I'd post a picture, but I cannot do that anymore for some reason.
@andyross hence the link, which should take you directly there. I believe forum admins put some kind of photo post block rule up.