Hi Viv
Thank you for the generous offer.  Perhaps you can help me break down my brick wall.  I'm trying to track the origins of my 2nd great grandfather, Francis Bennett (father Denis, mother Hannah) who came to Australia in the 1860s.  From certificates in Australia, it seems he was born somewhere between 1830 and 1840.
I think I have his family in 1851 - could you look at the census details to confirm that Denis is the head etc as I haven't got ages or relationships:
1851 Census Liverpool - Ref 2180/1 - 172A      
BENNETT   Bernard      Horse Shoer   Ireland
BENNETT   Dennis      Corn Porter   Ireland
BENNETT   Hannah      --   Ireland
BENNETT   James       --   Lancs, Liverpool
BENNETT   John      Scholar   Ireland
BENNETT   Michael      Errand Boy   Ireland
BENNETT   Patrick      Scholar   Lancs, Liverpool
I have been told that this entry is on LDS film number 87179 (I don't know if you need that).
Also on the same LDS film is:
1851 Census, Liverpool, Piece 2180/1, Folio #160A 
Bennett, Frank      corn porter                     Ireland 
This could be my Francis
and on on LDS film 87182 is: 
1851 Census Liverpool - Ref 2181/4 - 834
BENNETT                Arthur                -    Roper                  Lancs, Liverpool
BENNETT                Catherine           -    --                        Lancs, Liverpool
BENNETT                Frank                -     Dock Labourer     Lancs, Liverpool
This could also be him.  He is supposed to have been born in Liverpool, but there is a possibility that it could have been Ireland.
If it is possible to trace Denis and Hannah in the 1861 census, that would be tremendous.  
I think I have their deaths:
Deaths Mar 1866
Bennett  Hannah  50  Liverpool  8b 173 
Deaths Mar 1867
Bennett  Denis  57  Liverpool  8b 109 
I have been following a Patrick Bennett (1881 and 1891), who I am sure is the one from 1851 as he names some of his children  Hannah, Denis, Francis and Bernard.
Any infromation at all that you could get about Denis and Hannah would be wonderful, as what I have written above is all I have.
Regards
Shelley