Here (hopefully) is a static link to all the songs in uncompressed form in their allotted folders - so you can download any or all of the particular tracks you are trying to find.
Snip. Folders 1-16 of the NHS 2018 collection: https://mega.nz/#F!018zCICC!WBv8JINEEUYu4PZlDszwMg
Tracks available individually or as folder zips.
None of this would be possible without the efforts of many, many kind people in sharing/encoding/collating/recording et al - that is a fact that is never lost on me.
To all concerned - THANK YOU.