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My understanding is that Pott's Buildings were opposite the Quarryman's Arms Pub and Bainbridge Buildings in Eighton Banks, just above Rockcliffe Way. Both the Quarryman's Arms and the Bainbridge Terrace still exist today - if you use a modern day map - or Google Earth, you should be able to locate either of these buildings.

Thanks Maggie - similarly to Charlotte, I am nervous of deciding on Joseph's ancestry without a wedding certificate - I had found the baptism on Ancestry but not those of his potential siblings, so thank you for this helpful additional info - I can pursue this line back and see if it helps confirm any other facts - I have wondered about the Benjamin/Benham middle name that is periodically/interchangably used.  Joseph and Charlotte's third son was named Joseph Benham in 1866 and as I mentioned on Charlotte's death certificate she is the widow of Joseph Benham Robets master bootmaker -if that comes through further research of this new lead that would be a useful confirmation.

Sorry Maggie, posted too quick

On Joseph's death certificate his age is given as 69 years - daughter Minnie is the witness and for Charlotte her age is given as 78 - widow of Joseph Benham Roberts - daughter Julia is the witness.

I'm certain this is not my Charlotte Mead, as she and Joseph, a bootmaker, are together on the census until Joseph died on 13 March 1892. in 1861 Newington St Mary, 1871 Bermondsey, 1881 Camberwell, 1891 St Paul Deptford. Joseph died at 95 Bolina Road as did Charlotte in 1908. My grandmother Minne's wedding certificate in 1894 also list her address as 95 Bolina Road. Charlotte and Joseph had 7 children - Rosannah Charlotte 1855, Thomas 1858, William Henry 1860, Joseph Benham and Julia in 1866, Amelia 'Minnie' 1870 and Bertha in 1874.
I have checked Free BMD for their marriage but no luck so far - I thought it might help to view the original registration records, but I don't know which registry offices I should try

Thanks

Thank you for all your comments and suggestions. Now I have a firmer idea of when the photograph was taken, I can start thinking about who it might be. I have two weddings - my great great grandmother Anne Leah married her first husband in 1858 - so if it is a wedding photograph that is a possibility - her marriage to my great great grandfather Thomas Grant was 1866 so probably too late - but Thomas was illegitimate - stated clearly on his wedding certificate to Anne and his father was listed simply as 'Elizabeth Grant mother' (she was also a witness), which suggests a very close relationship with his mother, so if it is indeed mother and son it could be them.
I will almost certainly never know  who they are, but all your help and suggestions are much appreciated and I can now at least guess with more certainty.
Jackie