I've just posted a fairly extensive new article, about
Kampfgruppe 100, Ultra and the Coventry Blitz of November 1940.
My starting point was to find out what warning Ultra actually gave of the attack on Coventry. Lots has been written on the subject but I don't recall anyone actually quoting the message(s) themselves. These go a long way toward answering the questions of what they knew and when they knew it.
The rest of the files I used were located via a couple of word searches in the National Archives catalogue. These showed what the RAF did to try and forestall or disrupt the German attacks and what assumptions they made about the targets and timings and why.
I hope that it helps to fill out the picture that's been available hitherto.