Thank you so much Jean for all your superb detective work. I'll see if my cousin knows anything more - hopefully he'll reply tonight or in the next few days - before considering ordering the will, but you make a strong case for Eliza being the daughter (probably) of John Clark. I guess she could also be one of the 3 25 yr old Elizabeths , given the encouragement to round down ages to the nearest 5 - or else perhaps she was visiting the Ellis family or some other relations in the northwest, or, like many of my forebears, just did not appear in the 1841 census.

All good wishes,

Jo