Are entire folders missing, or just pics within existing folders whose location hasn't changed?
Only pics within folder whose location had changed; have been unable to "find" an image that sits beside one that has been "found".
To clarify, pics are in the one folder, however I need to search for each file individually to point LR at it's new location.
Hmm, I'm still not sure about your situation. But if the entire folder was missing (before you started finding individual pics), then it's easy to find the whole folder. You can see if the folder is missing by looking in the Folders pane on the left -- it will have a "?" on it:
Right-click on the folder and select Find Missing Folder.