In the past week I have downloaded and organised/tagged all the episodes and podcasts I could find, which means (I think) everything except the ones I mentioned.
I am very happy to upload them somewhere like archive.org or whatever. I have spent a lot of time on it (I have a certain amount of correct-tag-information obsession) and I'm happy to share it.
EDIT RE mentioned XFM thread: those links all appear to be to 4shared, not archive.org, but the episodes which are listed as unavailable in the thread are indeed unavailable on archive.org (or anywhere else) so I don't know if it's possible to dig them up anywhere.