Hi again Annette,
My cousin, Anne Jones, tells me that her tree is publically available on Ancestry under "Exall". She says that HJH Exall did have a son called Henry and his baptism is registered in Phillpots along with all the other children. She also says that the family was orginally called "Hexall".
Anne suggest that if you belong to Genes Reunited you can contact her through that.
I hope this helps.
Best wishes
Gillian