Hi again Annette,
I am sorry I can't prove that HJH Exall had a son called Henry. I only know of Clara, Almeira and Elenor. I note that my HJHE married Sarah Salmon on 22 October 1839 at St Peter Walworth and by the time of the 1861 census Sarah was widowed.
I will ask my cousin, Anne, if you can look at her tree. I believe that she belongs to Ancestry whereas I don't.
Best wishes
Gillian