Hi since the last posting things have moved on at a fair old pace,
Now have the following which i think will link in your William.
Mary was born Mary Keall Bynon I have her marriage certificate to Joseph Tettmar. Her father was John Bynon born as you say 1809 mother was Mary Skinner Keall marriage 06 April 1833 at St Pauls Portland place Bristol
therefore I believe your William and my Mary were brother and sister
My e mail is artorius
10@aol.comKeith