Hi, Helen,
Yes, it sounds very much as though my great-grandfather would have written those notes. There was a book on the Jerrards of Dorset written in 1912 by Frederick Bartholomew Jerrard, to which A W Gerrard contributed some comments about his Dorset Gerrard ancestors, hoping to uncover a line of descent. My father, S J Gerrard, wrote a book (2014) in which he supplemented AWG's research with findings of his own, but he never did discover a link to the Gerrards of Parnham: it looks as though our ancestors were relentlessly working-class.
Should I contact the DHC?