Found two 1841 census no idea if they're any good but not a common name one a Bricklayer and one a Shoemaker. First one has a Dennis with them wrong age though b 1839 but I suppose they could be connected!

http://search.ancestry.co.uk/cgi-bin...639&recoff=8+9

this one is unlikely but its not a common name at that time in London...

http://search.ancestry.co.uk/iexec?h...c=&pid=7036351