I take it you have seen this:

http://www.liverpoolblitz70.co.uk/

And this:

http://www.liverpoolmuseums.org.uk/nof/blitz/

and finally this:

http://www.yoliverpool.com/forum/showthread.php?50893-THE-BLITZ&highlight=liverpool+blitz

I will be down watching the parade etc on Saturday so if there is anything specific I may be able to help with drop me a PM