Came across this:
There’s already a release to cover the entire set, which looks to be how the music was sold originally.
It’s likely the individual volumes have been re-sold later on as individual titles.
Considering they dont even have unique barcodes, are we happy to merge these together?
hmm bizarre - shall i put in the edits to revert?
Unless there’s an official separate version you can find, then you should merge these back into the 10xCD.
ok will begin the slow and painful task of merging it back together 
for anyone following this
@jesus2099 has made an edit that does it all in one go (I didn’t realise you could do that)