@Squee7e -not at the moment I am afraid. The stock ED save feature seems to be lacking and the DML persistence also has some issues.
The mission will need to revised (I think I need to do things differently with Ai who do not get shot down) and I was going to ask tonight how people feel about another re-start. If people are happy then I will set about reconstructing the mission, but if people are done with this scenario I might move to another campaign implementing the changes I need in this one.