Thank you all for replying and the suggestions. Apologies for not staying on line or replying sooner.
Her marriage and death certs state Elizabeth Martha Barber, so I assumed she was registered as this. The 1881 census for her family lists her siblings as being born in Bermondsey so I was wondering if she was actually born there too. The birth in Q1 1872 St Savours Southwark (mentioned by Galium) I think may cover Bermondsey area
The marriage of Henry charles also in Southwark may fit. So think I will take a chance and order both of these. Have checked her siblings and there are entries in St Saviours for Alfred Henry and Thomas Edward - Martha St Olaves Southwark, so all around the same area.
Did I read it right - 1871 census Martha's husband insane???
I will follow up on Eliz Talbot as that sounds interesting. Are the Thetford records on line by chance?
I have only been researching for a few months and am completely addicted. Finding the London ancestors a bit tricky though, but have gone back to mid 1600 in Kent on one line (havent doubled checked all parish records yet though).
Thanks again
Horrie's dau!