Concerning this part of your fabulous Walpole family tree:
Generation 15 Robert Walpole, Esq. of Houghton, eldest son of Calibut Walpole, had married well, to Susan, daughter of Sir Edward Barkham of Southacre, Norfolk, by his second wife, Elizabeth Rolfe of Norfolk.
I believe that this information is incorrect (but willing to be corrected if anyone can prove otherwise)
Susan Barkham was NOT the daughter of Sir Edward Barkham and Elizabeth Rolfe.
Elizabeth Rolfe was NOT the wife of SIR Edward Barkham - she was his mother.
Sir Edward Barkham was the son of Edward Barkham and Elizabeth Rolfe.
Susan Barkham was the grand daughter of Edward Barkham (no Sir) and Elizabeth Rolfe and the daughter or Sir Edward Barkham and Jane Crouch who married in 1589. Susan was baptised 1595/6.
Apologies - just hate to see something incorrect in what is otherwise a fabulous document.