Hi Peter i would love to be able to go to a library over there but i am now living in australia so find it difficult now am past the government records i have looked at the cheshire parish register project but cant find him.
If your ancestor died before 1871 and was buried at Nantwich you should be able to find the record there. You can also look up the death index at www.freebmd.org.uk, or www.cheshirebmd.org.uk and find the reference to send for a certificate if required.
Jean
PS. Sorry, just realised you have already searched at the link above! As Peter suggests, if you can give us names and approximate dates we may be able to assist.