This is not strictly B&D but Ian first brought to my attention The Surman Index Online Dr Williams's Centre for Dissenting Studies on this list (Index is of Congregational and Independent Ministers). I found my 4G Grandfather Joseph Griffiths on the list as it gave his first Chapel as Bilston where my 3G Grandfather Apollos was born and baptised. Also listed were other chapels where he was a minister and checking baptisms at one I found another son William baptised 1820 from this I was able to check the 1841 census and there was William with his mother Mary (Joseph died Feb 1841) and possibly another son James (b1826 I am trying to find the register for the chapel where Joseph was minister at the time to confirm if he was his son). In the 1841 census, staying with Mary was a George Adams which helped to confirm I had the right marriage for Joseph. Finally in the Index there was the date of death for Joseph and although no confirmed source who his father was (another minister also in the Index). So it just goes to show the answers are out there, it's just knowing where. Tony