I've completed the crossword - correctly I think!
According to the preamble:
" Eight solutions are individuals of a kind, not further defined in their clues."
I reckon I can parse all the answers I have but I can only find 7 "individuals of a kind" and as far as I can see these are the only 7 that are "not further defined in their clues."
Anyone else who is doing this crossword having the same problem - or am I missing something (which I guess is quite likely!)
Don't want to say what I think the 7 are yet - puzzle is here:
(
http://www.theguardian.com/crosswords/prize/26501)