I appear to still be on the mailing list of the not-terribly-active Pearl Poet Society. Thus, I know this:
This resource is one part of London, British Library MS Cotton Nero A.x. (art. 3): A Digital Facsimile and Commented Transcription. Publications of the Cotton Nero A.x. Project 3 (Calgary: Cotton Nero A.x. Project, 2012).
For the commented transcription, to be published shortly after this digital facsimile, please see the main Web site of the Cotton Nero A.x. Project