How did you accomplish this move of your photos to a different drive? Exactly what steps did you follow in your Lightroom and in your operating system to achieve this?
I'm going to guess you imported or synchronized the photos on the new drive somewhere in the process. Is that correct?
Not sure I can remember every step as it was a few months ago. I migrated all my data as part of upgrading a few things on my system, and synchronised the folders, which I say are all there happily. I didn't re-import the folders into LR as I assumed I would love all the keywords and other tags Id applied when they were originally imported.
and synchronised the folders,
This was your mistake. When you synchronize, Lightroom assumes this is a new photo and doesn't know that it is part of a collection.
Do you still have a backup of your catalog file from before the move? Your collections are in there. If you do, maybe we can figure out how to make use of it.
I have looked at the catalog before I upgraded to LR5, and none of the Folders have their images, as the only drive it recognises in the old one thats been removed.and neither do the Collections have their images.
Yes, that's exactly what you would expect, and that's exactly the catalog you want to use.
You will need to reconnect the photos in that old catalog using these instructions: http://www.computer-darkroom.com/lr2_find_folder/find-folder.htm
Do NOT synchronize anything. Do NOT import anything. If you open this backup catalog and perform the fix described at that link, you now have a catalog where all the photos are "not missing" and the collections are intact.
If there are new photos added to your existing catalog after you performed this move, we can deal with those next. Let me know how it goes.