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It seems that John was probably correct with his suggestion of 24 Tickenham Road.  I have been in contact with a local historian in Clevedon who says that the cottages on Old Street are  "on the Tickenham Road, the houses set back by Clevedon Garages. They seem to have counted it as part of the Tickenham Road in the directories"

If you look at Google Street View you can see that the old house to the right of the garage has several "front doors" on various sides and was probably several cottages originally. 

None of the names you mention are at the address in 1911 or 1939. A Hannah Louisa SPROD can be found in Clevedon living in Hill Road in 1911 and 1939.  She was unmarried.  Not sure whether that helps!  

No burial of a Sarah Stratton SMITH but a Sarah SMITH was buried in Grave Tc 843 in 1947 aged 99.  She died 25th Nov 1947.  In the same grave is a Stratton James SMITH who died in 1929.  Is this the Sarah you are looking for?  

Louisa, Mary and Robert BLACKMORE were all buried in Tc 3303.  Robert, aged 63 in 1907, Mary (a widow aged 87 who died at Yarrow) in 1939 and Louisa, a spinster, aged 59 who died at Cotford Asylum, Norton Fitzwarren in 1938

There are 5 Stonebridge Cottages in Old Street Clevedon on the 1881 census.  If you could give us the name of the people involved it might be easier to help. 

Stonebridge Cottage, 24 Tickenham Road

May be ?