I think I’ve found my problem. It’s basically the same problem I had with restoring some of the other backups after I had re-installed Sailfish Prior to the re-install the application files were in /home/nemo/folder/file but with the re-install they are now in /home/defaultuser/folder/file.
When I look in the .json file I see references to /home/nemo which of course no longer exist. I expect these references need to be /home/defaultuser.
Am I correct in my assumptions? If so is there a way to rectify this?
I used the instructions here to solve the original problems I had with the restore process. [3.4.0 onwards?] Restore backup fails when restoring notes (here: from Xperia X to Xperia 10 II )
Will something like this work to restore my backup for Situations?
Edit
I created the symlink as shown in the linked thread and put the .json file into the folder where Situations wanted to import from, ran Situations from Terminal and the restore worked. 
Now to see if I can achieve the same for Barwal.
Edit 2
Hmmm, Situations ran once then crashed and will not run. It starts to launch then crashes. Back to the drawing board.
Edit 3
Had a DBus issue. Completely un-installed Situations and all the Sonar files and directories that were listed by searching in File Browser. Re-installed and it works again.