Hi Aquila
Just having a look around ...................
1881 - 3 Pitt Court, St George the Martyr Southwark
Walter HARRIS head mar 52? stone mason b.Lambeth
Elizabeth wife 49?? b.Southwark
Alice dau 14 b.Lambeth
Henry son 6 b.Southwark
Eliza dau 3 b.Southwark
RG11/529 folio 91 page 20
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1871 Wycliffe Road, Northfleet, Kent
Elizabeth HARRIS wife mar 36 no occupation b.not known
Frederic son 11 b.Lambeth
Florence E dau 9 b.Lambeth
George W son 6 b.Lambeth
Alice M dau 3 b.Lambeth
Louisa dau 1 b.Lambeth
RG10/896 folio 13 page 18
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1861 - St Albans Street, Lambeth
Walter HARRIS head mar 30 stone mason b.Lambeth
Elizabeth wife 23 b.Lambeth
Charles son 9 b.Lambeth
Walter son 2 b.Lambeth
Frederick son 1 b.Lambeth
RG9/353 folio 132 page 1
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Walter Henry Landells HARRIS baptised All Saints Lambeth 17 Apr 1859 son of Walter & Elizabeth of 25 Stanley Street, Brompton - stone mason
Florence Emily HARRIS baptised St Mary Lambeth 2 Mar 1862 dau of Walter & Elizabeth of St Albans St, stone mason
George William HARRIS baptised 10 Apr 1864 St Mary Lambeth son of Walter & Elizabeth of White Hart Square, mason
Alfred Ernest HARRIS baptised St Mary Lambeth 1 Oct 1865 son of Walter & Elizabeth of White Hart Square, stone mason
Assuming it is the correct family, have you tried comparing first names (forgetting about surnames) with birth registrations in the area to see if there are any possible matches
http://freebmd.rootsweb.com 
Casalguidi
