Thanks Frances. Thanks to NG Crowe's help last week I now know, via Wood's Atlas for Kirk Michael and tithe plan (?) 87t that in 1840 the part of 'Money Mollawg' owned by Jane Corkill was called Narvarnagh and seems to be quite small.

None of the William Corkill wills seem quite right. One with wife Jane was a Kneale.

There is an 1823 burial in Maughold and an 1823 Michael will. The marriage record says William was 'of Maughold' but he married in Michael - could the burial and will be for the same person?