Hi Geoff, that's very interesting. Do you know know what happened to John b1836? This is what I have for 'my' John DEER -
born c 1835 at either Linton or West Wratting Cambs. died 1892 Willesden (London) married 1859 Notting Hill (London) Maria DAVIS. children : (in no particular order) John Priscilla Harriet Ann Alice Sarah Elizabeth Alfred George James
John jnr and Alice both died 1871
My desc is through Sarah Elizabeth. John and Maria were my 3 times great grandies, if you think they belong to your DEERs I'd be happy to fill in the details of Sarah's desc.