I can't find them on 1871 but I did find a marriage
23/06/1869
Roberty Kells Wid musician, father William a soldier dec
to
Sarah Ann Matthews spin, father Samuel a printer
at St Marys Lambeth
both living Lambeth but no address
son Robert William born June qtr 1870 Westmister St M ref 1a 383, wonder where they wer ein 1871, perhaps he was abroad ?,the fact Mary was Irish would they have been resident in Ireland as at 1871
Perhaps son Roberts birth cert might reveal an address
Louisa Maud