I know this is an old thread, but I've just come across it.  I'm thinking of producing my own interpretations of the Ashover Dances and making them available on my website http://www.colinhume.com

Chris P. says the originals are in Derby Library.  I contacted them to see if I could get good photocopies of the original manuscript but they say they can't find any reference to it.  Can anyone provide any information?