Hi Sue, I think you are right about ROBT CORKILL and JANE LORD, I had a look at Erics suggestion of KERNEY/KEWLEY but these dont fit from IGI.data and in the case of Margaret Kewney she appears to be born 2yrs before William and Isabella married and william seems to be the only child oof William and Isabella Kerney (? different surnames)
If you approximate Roberts birth date taking 20yrs or so off the marraige date this give1785=-There is a bc for a Robert 2 Feb 1783 as a starting point , if this is he then his parents were John Corkill and Margaret Cannell? more research I think!
Have ordered the wills for Edward Corkill 1820 the local LDS centre say it wil be two weeks before the arrive, of interest the price per film is NZ$8.50 each
Regards Rob