Hi, Thanks for that. Yes I had seen that site and looked through it and I think that's where I started questioning the Caffell connection, even though it's been found that there were 2 children born to an Ellen Behan and William Caffell, and there's also been a death found for an Ellen Caffell.
At first look at all seems like it could be ok - and it could well be right - but to me it's not convincing me just yet.

For instance there's a marriage between Ellen Behan and William James Caffell in 1870 at St Pancras, Stepney, Middlesex London (i think that's hardly unlikely) and I couldn't find it on the Free BMD site.
Before that they had daughter Ellen Maria Caffell born 1868 in Tasmania and then son Henry Francis Caffell in 1872 in Tasmania.
However I have as you said, checked to see who submitted the information and I will contact him. I'd already emailed 2 other people whose websites I'd found information on, but no replies from them - yet.
I have also noticed on the Tasmanian Heritage pages that there's two Ellen BEHAN's and if that's correct, I get the feeling that people have got the two confused. Because they have different numbers, and one Ellen has no birth but shows the marriage to William Caffell and the two children Ellen Maria and Henry William - and the other Ellen born 1834, to John Sweeney and their children.
Thanks again.