Hi am & 2 other distant cousins are tracing the Lansdown tree as well ... our common ancestor is Daniel Lansdown b. 1802 Westminster, a Builder ...
We had thought his father was James Daniel Lansdown c.1780 Bristol & d.1838 London, an architect, who married 1.Sarah Pinchon & then later 2.Mary Ann Robson ... one of us is still working through loads of info. sent from another distant cousin in USA .... so we can clarify, if this is correct, then we have the Lansdown tree back to Bristol to around 1600 ....
I have loads of info. on the Lansdowns of Westminster, Camberwell, Lambeth ... so do get in touch!