Jen from RedInstead- an amazingly helpful and friendly relative stranger (no longer however) whom emailed me all day through the "missing content" saga. She even posted on her blog to try and find an answer for me. She sounded more excited than me when the content finally came back up again. (I was just exhausted!)
Thankyou! Thankyou! Thankyou Jen!
All the boys at FeedBurner.com - I have never found out what caused my missing code but I emailed 4 companies that day. All that could have been involved. The ONLY company to reply (and they did so quickly) was FeedBurner.com I had 6 emails from 4 different guys trying to solve the problem for me...even though FeedBurner had no responsibility for the issue. To date no other company has answered my emails.
So a big thank you to all the guys.
In the end, it seemed, something very neatly deleted my content code from my template (see post here). I had to re-apply my template, rebuild parts of it and re-publish again. Hubby-j kindly (?) pointed out, it is unlikely that it was just my clumsiness as if it were it would have been a much, much messier deletion job!
Thanks J for that one too!