In response to GUEST(Sean) 9th Feb.
The researchers always ignore Nigel Denver I think because he is not 'establishment', in fact he got banned from the BBC back in the 60's after making the Scottish Replican Songs record. It is a shame because Nigel is a font much knowledge when it comes to traditional folk music. He is similarly ignored by researchers for books and articles.
In response to PeterK(Fionn)- Nigel is still very much alive and still living in Birmingham (he's not difficult to find - try the telephone directory.