OK so at least I feel we're on the right track lol!
Tried renaming them but with limited success, and also now the "add runtime script" doesn't find them.

So I have a whole raft of runtimes, I had them named  "DL A3&H3" / "DL Hair" / "DL Lights"  ... etc. I just tried renaming all of them to DownloadA3&H3, and so on, took out any spaces etc.
It hasn't worked but is there a naming convention for the old runtime folders so that P8 can read them?